Story

I like scrcpy. It allows me to cast my phone to computer and use it ther thanks to cable technology (wifi works too). So, after hopping to Pop_OS! I reinstalled adb and scrcpy. But this time scrcpy didn't work. Instead it throw this error:

adb: error: failed to get feature set: device unauthorized. This adb server's $ADB_VENDOR_KEYS is not set Try 'adb kill-server' if that seems wrong. Otherwise check for a confirmation dialog on your device. ERROR: "adb push" returned with value 1

Easy way | Grant access using prompt on the phone

After enabling USB debugging in Developer options connect phone to computer and run scrcpy. Phone should prompt you for granting access to computer. All you have to do is accept and connection will be granted 🎉️

This prompt didn't appear on my phone. As it turns out, that prompt doesn't works as expected on some custom ROMS. After some digging online, I came across this answer on stack overflow. Which leads to a commit message for (new) adb authentication implemented in 2012. This prompt copies ~/.android/adbkey.pub on computer, $ADB_VENDOR_KEYS, to /data/misc/adb/adb_keys file in phone's memory. since prompt isn't working for me I have to add that key manually 😕️

Littler harder way | copy-paste using Termux + root

Since /data/misc/adb/adb_keys file is offlimits for the user, we need root priviledges for this method.

Copy ~/.android/adbkey.pub to phone's memory
Open Termux and install sudo > pkg install tsu
Navigate to where file adbkey.pub is. I'm using Redmi Note 4 and its /sdcard directory is used for .
File is at /sdcard/adbkey.pub in my case > cd /sdcard
Copy adbkey.pub to /data/misc/adb/adb_keys with sudo priviledges > sudo cp adbkey.pub /data/misc/adb/adb_keys
Double check if content of /data/misc/adb/adb_keys on phone and ~/.android/adbkey.pub on computer are the same
Enjoy 😊️

Hard way | copy-paste using TWRP

This is the "no-root" hard method. You will still need root priviledges to edit /data/misc/adb/adb_keys. If your phone isn't rooted but has TWRP, GREAT. TWRP has root priviledges and a file manager.

Boot into TWRP by holding Vol+ and Power keys while the phone is turned off.
Connect phone to computer
Copy ~/.android/adbkey.pub to phone's memory
Go to Advanced > File manager
Navigate to where adbkey.pub was copied to. I am using Redmi Note 4 and MTP connects to /sdcard on this device.
Copy adbkey.pub to /data/misc/adb/adb_keys
Delete adb_keys in
Rename adbkey.pub to abd_keys
Double check if content of /data/misc/adb/adb_keys on phone and ~/.android/adbkey.pub on computer are the same
Enjoy 😊️

SCRCPY is casting Android phone's screen on to computer after manually copying computer's adbkey.pub file to phone's adb_keys file

It was a little annoying adventure for me to find where the adbkey.pub suppose to go. I am not immitated with having to do that thing manually. I was annoyed that this information isn't out there in Android documentations and requires reading answers from 2014 on stack overflow.

I hope this guide was helpful to you 😊️

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