How is SN of the entire miner currently obtained in API and WhatsMinerTool?

If the firmware upgrade fails or the miner IP cannot be accessed in the backend on the browser after entering it, what could be the reason and how should I proceed?

What measures can I take if I am unable to download firmware or other files from the official website?

Regarding the inability of the miner to run on third-party platforms or update on WhatsMinerTool, could it be that there is an error with the miner or the connection?

In WhatsMinerTool, what precautions should users take before upgrading firmware?