Cannot reflash stock firmware on GL-MT1300

I have GL-MT1300 devices that I flashed openwrt 23.05.5/generic firmware on to test and now I want to go back to stock.
I can load the stock firmware from UBOOT(ver.4.3.19), but the WEB UI returns 404. The client is assigned an address of 192.168.8.0/24, but I cannot reach it by pinging 192.168.8.1, cannot connect via SSH either.
Now I can only load / re-load the generic version of OpenWRT.

I had a similar problem with GL-B2200 before. At that time, a Gl.inet technician provided me with a firmware recovery partition table.
Is a similar firmware recovery partition table required for GL-MT1300?

Can someone help me with this? I am at a loss and I fear I will never be able to get these back to stock.

When you flashed the vanilla OpenWRT, is it modified the partition table or uboot?

You can try to write the GL uboot version first, and then write the GL firmware.

IP 192.168.8.1 WebUI cannot be accessed probably try to clear the cache of browser.

The address of the 192.168.8.0/24 can be allocated. The starting of the router firmware should be normal. Around the router, have you seen the MT1300 SSID broadcast?