Please see [this][1] question for background information.

**Problem:**

Whenever I run `adb devices` it says `Error: device offline` - This appears even when no device is connected at all. It won't even let me start the adb server. Therefore solutions like "run `adb kill-server` first" won't have any affect.

**Things to note:**

- This is adb on another android device. I can not "re-install the android SDK platform" or something like that. It took me a long while to find the ARM binary for adb that works.
- From googling around, I suspect it might be that the adb binary is outdated, however it seemed to work recently for other people on [XDA-devs][2]. If anyone can provide me with a newer version of adb as a binary that will run on an ARM platform (android), I'd be happy to try it out.
- Yes, I do run `adb` as superuser (root). Other commands (like `adb --help` work).

The tablet runs android 4. The phone runs android 7 but that shouldn't matter since even without anything connected I can't even start the adb server on the tablet.

  [1]: https://android.stackexchange.com/questions/200010/is-there-a-way-to-run-adb-as-host-on-android-without-root
  [2]: https://forum.xda-developers.com/showthread.php?t=2586472