I have contacted the Cudy support by e-mail, but had no useful answer yet (apparently, there's no "intermediate firmware" for my hardware, up to now...)
About the "OEM" portion in your question, you mean the seller?
Considering that you have changed text and image since first message it's unclear of what you are trying to achieve.
If device is WR1300E v1.0, than there is no intermediate image available on Cudy googledrive, and no official OPenWrt image for 24.10 and snapshot. Apparently you are trying to install WR3000e image.
* damned letter "E" in the model: I've only noticed it after the delivery (up to the delivery, I thought I had bought a "WR1300"... buyed it just to install openwrt: bad purchase )