How to build an image for Huawei E970

Hi, I was trying to install OpenWrt in old Huawei E970 without success. I can upload files by webUI or serial but the CFE is not flashing... I found an old post about a patch and tried to contact the author who also made a bin file working, but got no answer yet.
Do you think I could do it by myself with some help or following instructions?
These are the old post
[OpenWrt-Devel] which openwrt bin file for huawei E970/E960 for web upgrade? (narkive.com)
[OpenWrt-Devel] [PATCHv2] Add support for Huawei E970 (narkive.com)
Thank you!

https://openwrt.org/toh/huawei/e970

Since the problem seems to be the CFE not accepting third-party firmware, wouldn't be the solution to replace it with another CFE? In that case, must it be specific for this device? Or can it be of the same version?