[OnePlus 7T Questions & Answers] tohtorin:
Oh well..

Upgraded from 10.0.4 to 10.0.6 via ota and boom my mobiledata is gone.

I do NOT want to factory reset. Lets try it if nothing else helps.

Can someone put somewhere where I can download files from 10.0.4 eu rom:

/system/priv-app/TeleService/*

My logcat shows:

FATAL EXCEPTION: main

Process: com.android.phone, PID: 10338

java.lang.RuntimeException: Unable to instantiate application com.android.phone.PhoneApp: java.lang.ClassNotFoundException: Didn't find class "com.android.phone.PhoneApp" on path: DexPathList[[zip file "/system/priv-app/TeleService/TeleService.apk"],nativeLibraryDirectories=[/system/priv-app/TeleService/lib/arm64, /system/priv-app/TeleService/TeleService.apk!/lib/arm64-v8a, /system/lib64, /product/lib64, /system/lib64, /product/lib64]]

at android.app.LoadedApk.makeApplication(LoadedApk.java:1226)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6594)

at android.app.ActivityThread.access$1600(ActivityThread.java:231)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1952)

at android.os.Handler.dispatchMessage(Handler.java:107)

at android.os.Looper.loop(Looper.java:214)

at android.app.ActivityThread.main(ActivityThread.java:7682)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.phone.PhoneApp" on path: DexPathList[[zip file "/system/priv-app/TeleService/TeleService.apk"],nativeLibraryDirectories=[/system/priv-app/TeleService/lib/arm64, /system/priv-app/TeleService/TeleService.apk!/lib/arm64-v8a, /system/lib64, /product/lib64, /system/lib64, /product/lib64]]

at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)

at java.lang.ClassLoader.loadClass(ClassLoader.java:379)

at java.lang.ClassLoader.loadClass(ClassLoader.java:312)

at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:76)

at android.app.Instrumentation.newApplication(Instrumentation.java:1153)

at android.app.LoadedApk.makeApplication(LoadedApk.java:1218)

... 9 more

Suppressed: java.io.IOException: Failed to open dex files from /system/priv-app/TeleService/TeleService.apk because: Failure to verify dex file '/system/priv-app/TeleService/TeleService.apk': Bad checksum (c0c2207c, expected 277e206c)

at dalvik.system.DexFile.openDexFileNative(Native Method)

at dalvik.system.DexFile.openDexFile(DexFile.java:365)

at dalvik.system.DexFile.<init>(DexFile.java:107)

at dalvik.system.DexFile.<init>(DexFile.java:80)

at dalvik.system.DexPathList.loadDexFile(DexPathList.java:444)

at dalvik.system.DexPathList.makeDexElements(DexPathList.java:403)

at dalvik.system.DexPathList.<init>(DexPathList.java:164)

at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:126)

at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:101)

at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:74)

at com.android.internal.os.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:87)

at com.android.internal.os.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:116)

at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:114)

at android.app.ApplicationLoaders.getClassLoaderWithSharedLibraries(ApplicationLoaders.java:60)

at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:851)

at android.app.LoadedApk.getClassLoader(LoadedApk.java:950)

at android.app.LoadedApk.getResources(LoadedApk.java:1188)

at android.app.ContextImpl.createAppContext(ContextImpl.java:2499)

at android.app.ContextImpl.createAppContext(ContextImpl.java:2491)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6497)

... 8 more