I seem to be unable to update to this last version from 388.2_2 on an RT-AX86U. I downloaded it and tried updating from the Administration - Firmware Upgrade page, as usually; the progress bar goes on, but then I log back in and the version is still 388.2_2. On the first attempt it didn't ask for a manual reboot, on the second it did and I rebooted it manually, but still the new version has not been installed. Has anyone encountered this problem, any ideas?