I have a problem that only happens on Android 8. I tried the emulators and was not able to recreate the problem. I need to find a way to get a test device with android 8 on it. I tried Amazon a few times but each phone that advertizes having Android 8 would show up with Android 9 or something else.

I currently have a Device: Galaxy J7 2018 (J737A).


  • Is there a way to revert my device to android 8/8.1? I have looked and have not found anything for this model number. Need the stock version.
  • Is there any online store that sells devices where users can choose Android OS?
  • Is there any other way to recreate a bug and debug on specific versions of Android e.g. Android 8 Oreo?
  • 1
    Android has a downgrade protection, so stock device with locked bootloader can not be downgraded. Your device has the correct age so that an Android 8 version should exist for it. Once unlocked you should be able to install (e.g. via Odin) a firmware downloaded e.g. via github.com/zacharee/SamloaderKotlin
    – Robert
    Commented Feb 1, 2022 at 18:09
  • Thanks, @Robert! I'll give this a try now.
    – Tim
    Commented Feb 1, 2022 at 20:05
  • @Robert Odin keeps failing <ID:0/007> Added!! <ID:0/007> Odin engine v(ID:3.1301).. <ID:0/007> File analysis.. <ID:0/007> Total Binary size: 5312 M <ID:0/007> SetupConnection.. <ID:0/007> Initialzation.. <ID:0/007> Set PIT file.. <ID:0/007> DO NOT TURN OFF TARGET!! <ID:0/007> Get PIT for mapping.. <ID:0/007> Firmware update start.. <ID:0/007> NAND Write Start!! <ID:0/007> SingleDownload. <ID:0/007> sboot.bin <ID:0/007> param.bin <ID:0/007> cm.bin <ID:0/007> FAIL! <ID:0/007> <ID:0/007> Complete(Write) operation failed. <OSM> All threads completed. (succeed 0 / failed 1)
    – Tim
    Commented Feb 1, 2022 at 22:37


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