We got an Error Code 2010 in WhatsMinerTool, what should we do?

I am still using an M21S miner and would like to know if a custom firmware is available to enable low-power mode operation?

My miner is now showing 4 error codes: 300, 320, 321, and 421. Could you please advise on how to resolve these errors?

I aim to maximize hashrate regardless of power consumption. In WhatsMinerTool, I have set the performance mode to Normal (10%-20%-30%-40%), but the hashrate does not reach the target value. What should I do?

I have a WhatsMiner miner and need to upgrade its firmware to the latest version. I do not have a computer, only an Android smartphone and an SD card. How can I complete the firmware upgrade without a computer?