New Around Here
Think I am going to have to try this also.I had this problem sense the firmware got bigger on my ac68u, I think it’s because ram is too low to accept the file as every time I tried it with my ram low it would do that (even if I had swap file)
so if I factory reset my router , clearing all scripts and things it would then take the new firmware
this is only my findings. I’m far from a professional like some of the others on here. But I think it’s what’s happening
Just had major issues on my RT-AC68U coming from 386.4, flash failed which killed my internet connection and usb but was still left on 386.4. Run a reboot which brought it back, then tried again, this time the firmware update failed and router went into bootloop/rescue mode... power light began to flash constantly. Tried a hard reset (using WPS button method) and full reset (using the reset button method) which did not work.
In the end I was forced to download the Asus restoration tool and flash directly via ethernet after placing the router in recovery mode, tried recovering with 386.5 first and it failed again!, then tried with 386.4 and the restore worked first time.
@RMerlin could the size of the new firmware file (>90 MB) be causing the flash to fail, especially with the meagre resources the AC68U and such have?