I would like to port OpenWrt to this router.
It originally ran the stock firmware, in Chinese.
There shouldn't be too many difficulties: in the past I've already tried the version for the 4A model (Chinese version, 100 Mb) and it worked. Now I should fix the mtd partitions.
Over the years I have done various tests, changing bootloader (Breed) and type of firmware (Padavan, Keenetic) and, more or less, it has always worked.
In this days I realized that the 5 GHz wireless no longer works, not even by reinstalling the stock bootloader and firmware.
Maybe it got damaged, or maybe there's some other problem.
With OpenWrt the PCI bus is not correctly recognized (mt7620-pci: probe of 10140000.pcie failed with error -1 or something similar). To this bus, if I understood correctly, the 5 Ghz wireless chip is connected, which is therefore not recognized.
In the past, the 5 GHz wireless worked, both with stock firmware and with OpenWrt (in the log the MT7612EN chip was recognized by its module, its firmware was loaded, etc.), albeit with poor performance.
Investigating, I realized that the Factory partition is corrupted (don't ask me how this happened).
I noticed this because MAC addresses were randomly assigned,
So I ask:
Does anyone have a Factory partition dump for this model? I tried that from a 4A router, but even if the MAC addresses are fixed, the 5GHz section is still not seen.
The dump is a file 0x10000 (65536) bytes long, and start with the hex values 0x76 0x01
Alternatively, a dump of the whole memory (about 16MB).
In order to be sure that the 5 GHz section is still working. Then I will continue with the development of a dedicated OpenWrt firmware.