I have a WhatsMiner M3 that runs CGMiner 4.9.2.
The official cgminer that I maintain and provide support for on this forum thread contains no M3 code. Seek help from whomever maintains your forked cgminer.
I'm not sure the device has or needs specific code. It's simply running the CGMiner software inside a small Linux kernel. As it runs CGMiner 4.9.2 I figured here would be the right place to come for support. At minimum it is too much to ask for some asisstance in understanding how to perform diagnostics on this thing using the features built into CGMiner 4.9.2 ?