Ok, found posts about recovery tool. That fixed the problem!

I also had the problem, that the tool didn't find my device. Additionally starting the tpPLC next to the recovery tool fixed this, device was found and could be recovered!

Hello, I tried to do a FW-Upgrade for a TL-PA9020 KIT with tpPLC. The first device was fine, the second didn`t finish. I waited about 30 minutes, then rebootet my laptop. Now all the LEDs of the...