When repairing the Whatsminer hash board, if the test fixture is the H6 control board, you need to download the H6OS test file and copy it the control board, which can test the Whatsminer M20 and M30 series hash boards, such as M21, M20s+, M30, M31s+...
Become a member of the crypto miner repair course, you can download it for free.
Note: This file is a data download package, and commercial communication is prohibited.