diff --git a/patches/RF24.patch b/patches/RF24.patch
deleted file mode 100644
index 63db8823..00000000
--- a/patches/RF24.patch
+++ /dev/null
@@ -1,35 +0,0 @@
-diff --git a/RF24.cpp b/RF24.cpp
-index 9e5b4a8..a4de63c 100644
---- a/RF24.cpp
-+++ b/RF24.cpp
-@@ -1871,6 +1871,11 @@ uint8_t RF24::getARC(void)
-     return read_register(OBSERVE_TX) & 0x0F;
- }
- 
-+uint8_t RF24::getPLOS(void)
-+{
-+    return read_register(OBSERVE_TX) & 0x0F;
-+}
-+
- /****************************************************************************/
- 
- bool RF24::setDataRate(rf24_datarate_e speed)
-diff --git a/RF24.h b/RF24.h
-index dbd32ae..a3d6b52 100644
---- a/RF24.h
-+++ b/RF24.h
-@@ -1644,6 +1644,7 @@ public:
-      * @return Returns values from 0 to 15.
-      */
-     uint8_t getARC(void);
-+    uint8_t getPLOS(void);
- 
-     /**
-      * Set the transmission @ref Datarate
-@@ -2415,4 +2416,4 @@ private:
-  * Use `ctrl+c` to quit at any time.
-  */
- 
--#endif // __RF24_H__
-\ No newline at end of file
-+#endif // __RF24_H__
diff --git a/scripts/applyPatches.py b/scripts/applyPatches.py
index 3289badb..147fb0f3 100644
--- a/scripts/applyPatches.py
+++ b/scripts/applyPatches.py
@@ -12,11 +12,11 @@ def applyPatch(libName, patchFile):
 
     os.chdir('.pio/libdeps/' + env['PIOENV'] + '/' + libName)
 
-    process = subprocess.run(['git', 'apply', '--reverse', '--check', '../../../../' + patchFile], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    process = subprocess.run(['git', 'apply', '--ignore-whitespace', '--reverse', '--check', '../../../../' + patchFile], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
     if (process.returncode == 0):
         print('\'' + patchFile + '\' already applied')
     else:
-        process = subprocess.run(['git', 'apply', '../../../../' + patchFile])
+        process = subprocess.run(['git', 'apply', '--ignore-whitespace', '../../../../' + patchFile])
         if (process.returncode == 0):
             print('\'' + patchFile + '\' applied')
         else:
@@ -32,5 +32,3 @@ if env['PIOENV'][:22] != "opendtufusion-ethernet":
 if env['PIOENV'][:13] == "opendtufusion":
     applyPatch("GxEPD2", "../patches/GxEPD2_SW_SPI.patch")
     applyPatch("RF24", "../patches/RF24_Hal.patch")
-else:
-    applyPatch("RF24", "../patches/RF24.patch")
diff --git a/src/CHANGES.md b/src/CHANGES.md
index a4942d55..f690b192 100644
--- a/src/CHANGES.md
+++ b/src/CHANGES.md
@@ -1,5 +1,24 @@
 # Development Changes
 
+## 0.8.68 - 2024-01-29
+* fix HMS / HMT startup
+* added `flush_rx` to NRF on TX
+* start with heuristics set to `0`
+* added warning for WiFi channel 12-14 (ESP8266 only) #1381
+
+## 0.8.67 - 2024-01-29
+* fix HMS frequency
+* fix display of inverter id in serial log (was displayed twice)
+
+## 0.8.66 - 2024-01-28
+* added support for other regions - untested #1271
+* fix generation of DTU-ID; was computed twice without reset if two radios are enabled
+
+## 0.8.65 - 2024-01-24
+* removed patch for NRF `PLOS`
+* fix lang issues #1388
+* fix build on Windows of `opendtufusion` environments (git: trailing whitespaces)
+
 ## 0.8.64 - 2024-01-22
 * add `ARC` to log (NRF24 Debug)
 * merge PR: ETH NTP update bugfix #1385
@@ -160,7 +179,7 @@
 
 ## 0.8.37 - 2023-12-30
 * added grid profiles
-* format version of grid profile 
+* format version of grid profile
 
 # RELEASE 0.8.36 - 2023-12-30
 
diff --git a/src/app.cpp b/src/app.cpp
index 9f569259..a14a8811 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -47,7 +47,7 @@ void app::setup() {
     }
     #if defined(ESP32)
     if(mConfig->cmt.enabled) {
-        mCmtRadio.setup(&mConfig->serial.debug, &mConfig->serial.privacyLog, &mConfig->serial.printWholeTrace, mConfig->cmt.pinSclk, mConfig->cmt.pinSdio, mConfig->cmt.pinCsb, mConfig->cmt.pinFcsb);
+        mCmtRadio.setup(&mConfig->serial.debug, &mConfig->serial.privacyLog, &mConfig->serial.printWholeTrace, mConfig->cmt.pinSclk, mConfig->cmt.pinSdio, mConfig->cmt.pinCsb, mConfig->cmt.pinFcsb, mConfig->sys.region);
     }
     #endif
     #ifdef ETHERNET
diff --git a/src/app.h b/src/app.h
index 851ad3c8..ccf46297 100644
--- a/src/app.h
+++ b/src/app.h
@@ -182,6 +182,10 @@ class app : public IApp, public ah::Scheduler {
             return mWifi.getStationIp();
         }
 
+        bool getWasInCh12to14(void) const {
+            return mWifi.getWasInCh12to14();
+        }
+
         #endif /* !defined(ETHERNET) */
 
         void setRebootFlag() {
diff --git a/src/appInterface.h b/src/appInterface.h
index ad38f756..f98fb0cb 100644
--- a/src/appInterface.h
+++ b/src/appInterface.h
@@ -35,6 +35,7 @@ class IApp {
         virtual void setupStation(void) = 0;
         virtual void setStopApAllowedMode(bool allowed) = 0;
         virtual String getStationIp(void) = 0;
+        virtual bool getWasInCh12to14(void) const = 0;
         #endif /* defined(ETHERNET) */
 
         virtual uint32_t getUptime() = 0;
diff --git a/src/config/settings.h b/src/config/settings.h
index d8c93b10..e074d5b1 100644
--- a/src/config/settings.h
+++ b/src/config/settings.h
@@ -30,7 +30,7 @@
  * https://arduino-esp8266.readthedocs.io/en/latest/filesystem.html#flash-layout
  * */
 
-#define CONFIG_VERSION      9
+#define CONFIG_VERSION      10
 
 
 #define PROT_MASK_INDEX     0x0001
@@ -68,6 +68,8 @@ typedef struct {
     uint16_t protectionMask;
     bool darkMode;
     bool schedReboot;
+    uint8_t region;
+    int8_t timezone;
 
 #if !defined(ETHERNET)
     // wifi
@@ -395,6 +397,8 @@ class settings {
             #endif /* !defined(ETHERNET) */
 
             snprintf(mCfg.sys.deviceName,  DEVNAME_LEN, DEF_DEVICE_NAME);
+            mCfg.sys.region   = 0; // Europe
+            mCfg.sys.timezone = 1;
 
             mCfg.nrf.pinCs             = DEF_NRF_CS_PIN;
             mCfg.nrf.pinCe             = DEF_NRF_CE_PIN;
@@ -512,6 +516,10 @@ class settings {
                 if(mCfg.configVersion < 9) {
                     mCfg.inst.gapMs = 1;
                 }
+                if(mCfg.configVersion < 10) {
+                    mCfg.sys.region   = 0; // Europe
+                    mCfg.sys.timezone = 1;
+                }
             }
         }
 
@@ -537,6 +545,8 @@ class settings {
                 obj[F("prot_mask")] = mCfg.sys.protectionMask;
                 obj[F("dark")] = mCfg.sys.darkMode;
                 obj[F("reb")] = (bool) mCfg.sys.schedReboot;
+                obj[F("region")] = mCfg.sys.region;
+                obj[F("timezone")] = mCfg.sys.timezone;
                 ah::ip2Char(mCfg.sys.ip.ip, buf);      obj[F("ip")]   = String(buf);
                 ah::ip2Char(mCfg.sys.ip.mask, buf);    obj[F("mask")] = String(buf);
                 ah::ip2Char(mCfg.sys.ip.dns1, buf);    obj[F("dns1")] = String(buf);
@@ -554,6 +564,8 @@ class settings {
                 getVal<uint16_t>(obj, F("prot_mask"), &mCfg.sys.protectionMask);
                 getVal<bool>(obj, F("dark"), &mCfg.sys.darkMode);
                 getVal<bool>(obj, F("reb"), &mCfg.sys.schedReboot);
+                getVal<uint8_t>(obj, F("region"), &mCfg.sys.region);
+                getVal<int8_t>(obj, F("timezone"), &mCfg.sys.timezone);
                 if(obj.containsKey(F("ip"))) ah::ip2Arr(mCfg.sys.ip.ip,      obj[F("ip")].as<const char*>());
                 if(obj.containsKey(F("mask"))) ah::ip2Arr(mCfg.sys.ip.mask,    obj[F("mask")].as<const char*>());
                 if(obj.containsKey(F("dns1"))) ah::ip2Arr(mCfg.sys.ip.dns1,    obj[F("dns1")].as<const char*>());
diff --git a/src/defines.h b/src/defines.h
index b8ddace9..442008ff 100644
--- a/src/defines.h
+++ b/src/defines.h
@@ -13,7 +13,7 @@
 //-------------------------------------
 #define VERSION_MAJOR       0
 #define VERSION_MINOR       8
-#define VERSION_PATCH       64
+#define VERSION_PATCH       68
 
 //-------------------------------------
 typedef struct {
diff --git a/src/hm/Communication.h b/src/hm/Communication.h
index 8887a4a2..5725f2ec 100644
--- a/src/hm/Communication.h
+++ b/src/hm/Communication.h
@@ -136,7 +136,8 @@ class Communication : public CommQueue<> {
                             DBGPRINT(F("request timeout: "));
                             DBGPRINT(String(q->iv->radio->mRadioWaitTime.getRunTime()));
                             DBGPRINTLN(F("ms"));
-                                                    }
+                        }
+
                         if(!q->iv->mGotFragment) {
                             if(INV_RADIO_TYPE_CMT == q->iv->ivRadioType) {
                                 #if defined(ESP32)
diff --git a/src/hm/HeuristicInv.h b/src/hm/HeuristicInv.h
index 505562e3..89099ca8 100644
--- a/src/hm/HeuristicInv.h
+++ b/src/hm/HeuristicInv.h
@@ -1,5 +1,5 @@
 //-----------------------------------------------------------------------------
-// 2023 Ahoy, https://github.com/lumpapu/ahoy
+// 2024 Ahoy, https://github.com/lumpapu/ahoy
 // Creative Commons - http://creativecommons.org/licenses/by-nc-sa/4.0/deed
 //-----------------------------------------------------------------------------
 
diff --git a/src/hm/hmRadio.h b/src/hm/hmRadio.h
index a88e43c6..d1dd42d5 100644
--- a/src/hm/hmRadio.h
+++ b/src/hm/hmRadio.h
@@ -77,7 +77,7 @@ class HmRadio : public Radio {
             #else
                 mNrf24->begin(mSpi.get(), ce, cs);
             #endif
-            mNrf24->setRetries(3, 15); // wait 3*250 = 750us, 16 * 250us -> 4000us = 4ms
+            mNrf24->setRetries(3, 9); // wait 3*250 = 750us, 16 * 250us -> 4000us = 4ms
 
             mNrf24->setDataRate(RF24_250KBPS);
             //mNrf24->setAutoAck(true); // enabled by default
@@ -176,6 +176,7 @@ class HmRadio : public Radio {
                         rx_ready = false;
                         mRadioWaitTime.startTimeMonitor(DURATION_PAUSE_LASTFR); // let the inverter first end his transmissions
                         mNrf24->stopListening();
+                        return false;
                     } else {
                         innerLoopTimeout = DURATION_LISTEN_MIN;
                         mTimeslotStart = millis();
@@ -187,6 +188,7 @@ class HmRadio : public Radio {
                             } else
                                 mRxChIdx = tempRxChIdx;
                         }
+                        return true;
                     }
                     rx_ready = false; // reset
                     return mNRFisInRX;
diff --git a/src/hm/radio.h b/src/hm/radio.h
index 9702c304..7bbb42bc 100644
--- a/src/hm/radio.h
+++ b/src/hm/radio.h
@@ -127,7 +127,8 @@ class Radio {
                 mDtuSn |= (t << i);
             }
             mDtuSn |= 0x80000000; // the first digit is an 8 for DTU production year 2022, the rest is filled with the ESP chipID in decimal
-                    }
+        }
+
 
 
         uint32_t mDtuSn;
diff --git a/src/hms/hmsRadio.h b/src/hms/hmsRadio.h
index 07afd4b8..ae9fd369 100644
--- a/src/hms/hmsRadio.h
+++ b/src/hms/hmsRadio.h
@@ -76,7 +76,7 @@ class CmtRadio : public Radio {
             return true;
         }
 
-uint16_t getBaseFreqMhz(void) override {
+        uint16_t getBaseFreqMhz(void) override {
             return mCmt.getBaseFreqMhz();
         }
 
diff --git a/src/web/RestApi.h b/src/web/RestApi.h
index 98e0afd2..ccdc8747 100644
--- a/src/web/RestApi.h
+++ b/src/web/RestApi.h
@@ -268,6 +268,8 @@ class RestApi {
             obj[F("menu_protEn")] = (bool) (strlen(mConfig->sys.adminPwd) > 0);
             obj[F("cst_lnk")]     = String(mConfig->plugin.customLink);
             obj[F("cst_lnk_txt")] = String(mConfig->plugin.customLinkText);
+            obj[F("region")]      = mConfig->sys.region;
+            obj[F("timezone")]    = mConfig->sys.timezone;
 
         #if defined(ESP32)
             obj[F("esp_type")]    = F("ESP32");
@@ -651,6 +653,9 @@ class RestApi {
             obj[F("fcsb")]  = mConfig->cmt.pinFcsb;
             obj[F("gpio3")] = mConfig->cmt.pinIrq;
             obj[F("en")]    = (bool) mConfig->cmt.enabled;
+            std::pair<uint16_t, uint16_t> range = mRadioCmt->getFreqRangeMhz();
+            obj[F("freq_min")] = range.first;
+            obj[F("freq_max")] = range.second;
         }
 
         void getRadioCmtInfo(JsonObject obj) {
@@ -749,6 +754,12 @@ class RestApi {
                 warn.add(F(REBOOT_ESP_APPLY_CHANGES));
             if(0 == mApp->getTimestamp())
                 warn.add(F(TIME_NOT_SET));
+            #if !defined(ETHERNET)
+                #if !defined(ESP32)
+                if(mApp->getWasInCh12to14())
+                    warn.add(F(WAS_IN_CH_12_TO_14));
+                #endif
+            #endif
         }
 
         void getSetup(AsyncWebServerRequest *request, JsonObject obj) {
diff --git a/src/web/html/setup.html b/src/web/html/setup.html
index b4c72069..d4f245ef 100644
--- a/src/web/html/setup.html
+++ b/src/web/html/setup.html
@@ -26,6 +26,14 @@
                                 <div class="col-4 col-sm-9"><input type="checkbox" name="darkMode"/></div>
                                 <div class="col-12">{#DARK_MODE_NOTE}</div>
                             </div>
+                            <div class="row mb-3">
+                                <div class="col-8 col-sm-3">{#REGION}</div>
+                                <div class="col-4 col-sm-9" id="region"></div>
+                            </div>
+                            <div class="row mb-5">
+                                <div class="col-8 col-sm-3">{#TIMEZONE}</div>
+                                <div class="col-4 col-sm-9" id="timezone"></div>
+                            </div>
                             <div class="row mb-3">
                                 <div class="col-8 col-sm-3">{#CUSTOM_LINK}</div>
                                 <div class="col-4 col-sm-9"><input type="text" name="cstLnk"/></div>
@@ -499,9 +507,6 @@
             for(var i = 0; i < 31; i++) {
                 esp32cmtPa.push([i, String(i-10) + " dBm"]);
             }
-            for(var i = 12; i < 41; i++) {
-                esp32cmtFreq.push([i, freqFmt.format(860 + i*0.25) + " MHz"]);
-            }
             /*ENDIF_ESP32*/
             var led_high_active = [
                 [0, "{#PIN_LOW_ACTIVE}"],
@@ -650,6 +655,14 @@
                     el.push(mlCb("protMask" + i, a[i], chk))
                 }
                 d.append(...el);
+
+                var tz = []
+                for(i = 0; i < 24; i += 0.5)
+                    tz.push([i, ((i-12 > 0) ? "+" : "") + String(i-12)]);
+                document.getElementById("timezone").append(sel("timezone", tz, obj.timezone + 12))
+                var region = [[0, "Europe (860 - 870 MHz)"], [1, "USA, Indonesia (905 - 925 MHz)"], [2, "Brazil (915 - 928 MHz)"]]
+                document.getElementById("region").append(sel("region", region, obj.region))
+
             }
 
             function parseGeneric(obj) {
@@ -1019,6 +1032,12 @@
                         ])
                     );
                 }
+
+                var i = 0
+                while(obj.freq_max >= (obj.freq_min + i * 0.25)) {
+                    esp32cmtFreq.push([i, freqFmt.format(obj.freq_min + i * 0.25) + " MHz"])
+                    i++
+                }
             }
             /*ENDIF_ESP32*/
 
diff --git a/src/web/lang.h b/src/web/lang.h
index 546399aa..e55493eb 100644
--- a/src/web/lang.h
+++ b/src/web/lang.h
@@ -18,6 +18,12 @@
     #define TIME_NOT_SET "time not set. No communication to inverter possible"
 #endif
 
+#ifdef LANG_DE
+    #define WAS_IN_CH_12_TO_14 "Der ESP war in WLAN Kanal 12 bis 14, was uU. zu Abstürzen führt"
+#else /*LANG_EN*/
+    #define WAS_IN_CH_12_TO_14 "Your ESP was in wifi channel 12 to 14. It may cause reboots of your AhoyDTU"
+#endif
+
 #ifdef LANG_DE
     #define INV_INDEX_INVALID "Wechselrichterindex ungültig; "
 #else /*LANG_EN*/
diff --git a/src/web/lang.json b/src/web/lang.json
index 1eece937..d083ddff 100644
--- a/src/web/lang.json
+++ b/src/web/lang.json
@@ -148,6 +148,16 @@
                     "en": "(empty browser cache or use CTRL + F5 after reboot to apply this setting)",
                     "de": "(der Browser-Cache muss geleert oder STRG + F5 gedr&uuml;ckt werden, um diese Einstellung zu aktivieren)"
                 },
+                {
+                    "token": "REGION",
+                    "en": "Region",
+                    "de": "Region"
+                },
+                {
+                    "token": "TIMEZONE",
+                    "en": "Timezone",
+                    "de": "Zeitzone"
+                },
                 {
                     "token": "CUSTOM_LINK",
                     "en": "Custom link (leave empty to hide element in navigation)",
@@ -670,7 +680,7 @@
                 },
                 {
                     "token": "INV_DELETE_SURE",
-                    "en": "do you realy want to delete inverter?",
+                    "en": "do you really want to delete inverter?",
                     "de": "Willst du den Wechselrichter wirklich l&ouml;schen?"
                 },
                 {
@@ -1070,7 +1080,7 @@
                 },
                 {
                     "token": "WARN_DIFF_ENV",
-                    "en": "your environment does not match the update file!",
+                    "en": "your environment may not match the update file!",
                     "de": "Die ausgew&auml;hlte Firmware passt u.U. nicht zum Chipsatz!"
                 },
                 {
diff --git a/src/web/web.h b/src/web/web.h
index ba4540b1..6de9c877 100644
--- a/src/web/web.h
+++ b/src/web/web.h
@@ -481,7 +481,8 @@ class Web {
                 request->arg("device").toCharArray(mConfig->sys.deviceName, DEVNAME_LEN);
             mConfig->sys.darkMode = (request->arg("darkMode") == "on");
             mConfig->sys.schedReboot = (request->arg("schedReboot") == "on");
-
+            mConfig->sys.region = (request->arg("region")).toInt();
+            mConfig->sys.timezone = (request->arg("timezone")).toInt() - 12;
 
             if (request->arg("cstLnk") != "") {
                 request->arg("cstLnk").toCharArray(mConfig->plugin.customLink, MAX_CUSTOM_LINK_LEN);
diff --git a/src/wifi/ahoywifi.cpp b/src/wifi/ahoywifi.cpp
index defca5bc..9bcbdadc 100644
--- a/src/wifi/ahoywifi.cpp
+++ b/src/wifi/ahoywifi.cpp
@@ -92,6 +92,8 @@ void ahoywifi::tickWifiLoop() {
             }
             #if !defined(ESP32)
             MDNS.update();
+            if(WiFi.channel() > 11)
+                mWasInCh12to14 = true;
             #endif
             return;
         case IN_AP_MODE:
diff --git a/src/wifi/ahoywifi.h b/src/wifi/ahoywifi.h
index 7fb62a20..709c08c4 100644
--- a/src/wifi/ahoywifi.h
+++ b/src/wifi/ahoywifi.h
@@ -37,6 +37,10 @@ class ahoywifi {
         }
         void setupStation(void);
 
+        bool getWasInCh12to14() const {
+            return mWasInCh12to14;
+        }
+
     private:
         typedef enum WiFiStatus {
             DISCONNECTED = 0,
@@ -86,6 +90,7 @@ class ahoywifi {
         bool mGotDisconnect;
         std::list<uint8_t> mBSSIDList;
         bool mStopApAllowed;
+        bool mWasInCh12to14 = false;
 };
 
 #endif /*__AHOYWIFI_H__*/