That will just wait for command to finish properly and then run yes.

What you want to run is yes | command, so it spams the command with confirmations.

Omg I completely forgot they had a proprietary flasher, yeah that makes it much worse.

E: wasn’t there an open source implementation called Heimdall?

How is it being a samsung making things worse? I’ve never flashed a samsung phone before so I may be very wrong, but isn’t unlocking the bootloader easy?

And now that I think about, does samsung have their own system file format or something? Is that the issue?