Can't update firmware

[nfshp253]

I've got a stupid question. I'm trying to update my RT-AX56U that is currently on Merlin 388.2_2, but when I go to the Firmware Upgrade page and try to click on Upload, nothing happens. I'm expecting a file explorer pop-up to select the file but I can't do anything. I've tried this on Chrome and Edge on multiple computers and even on my iPhone's Safari and Chrome, but it seems that the Upload link is just broken. How can I update the firmware in this case? Thanks!

 

[ColinTaylor]

Sounds like exactly the same problem discussed in this thread. Use Rescue Mode.

[Wireless Router] How to use Rescue Mode (Firmware Restoration)? | Official Support | ASUS USA