We can use Innosilicon power supply G1266 firmware to fix abnormal voltage failure.
When downloading and using the G1266 PSU firmware, please confirm whether the code on the Innosilicon power supply box is G1266. Only an upgrade with the same firmware will fix the power supply and return to normal.
This link is a digital file, which can be downloaded for free as a student of the ZMRC bitcoin miner repair training course.