Here you will learn how easy is to disasembly samsung a12, is very easy to take apart its plastic back door with a plastic tool. Please take care with the fingerprint ribbon so you don´t break it while opening the phone.
...
https://www.youtube.com/watch?v=3Kac-QkeWOw
Solution for no booteable devices found on dell laptops, 2 different options in 2 different types of bios.
I tech you how to solve easy No bootable device found dell problem, easy steps, that everybody can do.
...
https://www.youtube.com/watch?v=DtlMk5_KFlI