adb restore  does nothing I followed the guidance here to do a FreeOTP backup with adb backup -f &lt;backup path&gt; org.fedorahosted.freeotp. After I wiped my phone and tried to do an `adb restore  I get the message "Now unlock your device and confirm the restore operation." but nothing on my phone happens or prompts, nor does FreeOTP have any keys installed. 

I am on Android 8.1 with adb 1.0.32 on Ubuntu 14.04.
I guess the adb from sudo apt-get install android-tools-adb was a bit too out of date. I downloaded the latest version from https://developer.android.com/studio/releases/platform-tools.html and extracted just the adb command, which is Android Debug Bridge version 1.0.39 Version 0.0.1-4500957, ran it and my phone prompted for a "full restore" which sounds scary but in the end just did a full restore of the FreeOTP. After it was done I have my keys back, yay!