well what i said is words of the guy who actually got a ban or so he said, it was 3 years ago tho
maybe they changed it, idk
not like i am gonna verify it
use a file manager like zarchiver and Storage/Android/data/com.aniplex.fategrandorder.en/files/data
now u need to follow the instruction from that reddit thread
with thise u no longer need to issue transfer id each time on new device, just replace the required files
yea, and no u dont need another, those files u need to copy act as save files so even if u delete fgo on same phone , as long as u replace the files with those u "copied" u can use ur desired acc
the only warning is not open same acc on diff devices at the same time, 100% ban