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!