SO-02 4 in 1

I have sovol so-02 4in 1 and i some how flashed it to grbl 1.1h and now my pwm is not working and ive even tried to flash back 1.1f but it wont flash back. But no we my laser is not working at all

Could you please try to flash the firmware? If it doesn’t work, please take a video of that

Is there a certain flashing program i should use

All you should have to do is load the .bin file on an SD card, insert it into the printer while it’s turned off, and then turn the printer on.