Syntakt error msg when updated

I just tried to update my syntakt and I keep getting a error msg boostrap error it didn’t update it had a error now I can’t get back into the system what do I do ? Please help . it won’t let me factory reset either tried FUNC power on it don’t do nothing how do i get back into this

Bootstrap upgrade - upgrade failed CRC Check – I can’t factory reset it FUNC while power on not doing anything I just keep getting a screen says. 1…TEST. 4… OS Upgrade – even when I hit 4 it just says Ready to recieve. – even with usb plugged in I can’t see it on my Transfer app anymore won’t show up as a device

please help how can I fix this I just got second hand it was working fine before the update hope someone can help fix

3 posts were merged into an existing topic: Error updating to 1.20. Made several attempts

posted in 3 different places - now in existing topic on this issue