Apologies for the post in English.

I have an MF286D which was originally a Three UK branded unit (judging by the stickers underneath).  I bought it refurbished from an Amazon reseller and it was running Nordic B11 firmware and B02 modem when I received it.

I wanted to upgrade the modem so I opened the unit, connected the serial port and updated the modem from B02 to B11 one step at a time using the delta packages from "Nordic Modem Update (upto B12)".  I ended up with the  unit running matching Nordic B11 firmware and B11 modem.

I then attempted to FOTA the firmware and modem up to B12 which failed as I hadn't read about faking the IMEI.  The unit was still working fine when I decided to do a factory reset. 

At this point the system went into a boot loop with a kernel panic on every startup.  I attempted to restore the unit using my saved mtd8.bin and mtd9.bin but it still crashed repeatedly on startup.

Figuring I didn't have much to lose I TFTP updated the unit to openwrt - initially luci-23.05-snapshot-r23403-736e3b81aa-ipq40xx-generic-zte_mf286d-squashfs-sysupgrade from eko one and later openwrt-snapshot-r23741-497012ab4e-ipq40xx-generic-zte_mf286d-squashfs-sysupgrade from 4IceG's github. 

Both of these Openwrt images boot and seemed to run fine with ethernet and LTE interface working, but I couldn't get WiFi to work.  On inspecting the logs it looks like something is going wrong with the loading of the ath10k firmware after which the kernel driver throws an exception.

It seems strange that the unit was working fine, and then suddenly following a factory reset three different firmwares (Nordic B11, luci-23.05-snapshot and 4IceG's latest release) all started failing in similar ways.

I attach an example log from luci-23.05-snapshot and would be grateful if anyone can suggest anything I could try to fix this problem.

https://drive.google.com/file/d/1cAtZ8s … sp=sharing

Thanks

John