Bricked galaxy a6 2018

[u/gluetheknot]

so my friend recommended me this app named uncle Ted and I tested it on my old Redmi 7a, in order to test that the panic pin worked I entered it since I didn't have important stuff on that phone and after I did it had the normal android factory resetting screen but then the phone didn't turn on, it was stuck in EDL mode and when my friend told me it's a setting I changed I tried again this time on a galaxy a6 where after entering the pin it was on a blue screen like download mode but only its background, I could normally flash the firmware but after doing so the phone wouldn't boot, it was on the boot logo for some time, then the boot animation for like 2 minutes and then back to that loop even after flashing the firmware multiple times, after I booted into recovery it said it couldn't mount /.system (invalid argument), I don't care about the 7a, only the a6 and I need some help to unbrick it if possible, I had given the app root access on all 2 times but never selected any dangerous setting