I forgot my pin on my flipper zero and i have tried doing factory reset a lot of times. Does having a sd card change anything? I forgot I had my flipper after lots of attempts and I took the card out.
I would backup the SD card to a computer and try to flash the Flipper in DFU mode. Then you should be able to restore files to the Flipper. The Flipper app might be able to do a backup as well but the restore might also restore the pin.