My relative's Samsung Galaxy A20e smartphone got stuck while reading SMS. I wanted to help him and pressed buttons for reset, but only a black screen appeared, now it gets stuck at booting. I can enter recovery mode but can't even do a factory reset because he doesn't know his Google email and password. But before that, I want to rescue all the data on the smartphone.
I tried Android Debug Bridge, but he hasn't activated USB debugging, so I'm only able to do adb sideload
. I tried TWRP by sideload, doesn't work. I know Odin on Windows to install alternative custom ROM, but I'm now on Linux.
What software can I use to install custom ROM and TWRP, or what can I do to rescue the data on the smartphone - images, phone numbers, addresses? Do I have to unlock the bootloader before I can download a custom ROM?