Here is a step-by-step tutorial for upgrading the MicroBT Whatsminer test power firmware.
1. Power Repair Test Firmware Instructions:
Firmware: Whatsminer Test Power Firmware
PSU scope of use: P21, P21D, P21E, P221C, P222C, P221B, P222B
Control board type: H3, H6OS, H616
Tool：whatsminer tool 8.1.34
Check the IP, click “upgrade”-“select file”-“star upgrade” after using WhatsMiner Tools 8.1.34 to scan for the control board’s IP address.’
Check the version information to make sure the “version info” has been changed to 20220420 after the upgrade is successful.
Plug the network cable in and connect the PSU to the control board.
Check the voltage after turning the PSU on.
6. Power off:
Repeat steps 4-5 for the following PSU that needs to be tested.