UBoot should definitely work if you’re doing it correctly. Make sure you set you computer lan adapter as described. I also run a constant ping from windows command terminal to see when to release the reset button. Much easier than relying on the the lights flashing. Release as soon as it starts communicating. The constant ping command is: ping 192.168.1.1 -t
Also, don’t for get to set the adapter back to automatic after the flash takes and try connecting by default address 192.168.8.1 if loading the GL.net firmware. I have also had to clear my browser cache sometimes.
So you pressed and held the reset button in and waited for it to communicate then released using the terminal command I gave? It never showed replying, only showed no response?
If that ping never comes back with a response then I don’s know what to do, it may be totally locked up. Again, verify your computer adapter is set correctly and doing that constant ping before you start. If you still can’t get in then I don’t have anything further to try, sorry.
PS: No help now but in the future if ever jumping between different variants of firmware never use the built in UI, only use the recovery/debrick method to install. Good luck, hope you get it going again.