I'm having trouble updating RT-N66U from 3.0.0.4.382_51641 to this release: RT-N66U_374.43_52E3j9527
I get the "Please wait, Applying settings..." message for a few seconds then it disappears and the router is still on the old FW.
I've factory reset the router and also "hard reset" according to...
Thanks for pointing me in the right direction. Here's a link if anyone comes across this: http://www.snbforums.com/threads/fork-asuswrt-merlin-374-lts-release-52e3.75496/
A year later (Nov 2021), I just updated my RTN-66U to this FW. Several serious issues:
VPN unstable, connect/disconnect clients
Unable to access internal/external network through VPN
UI very slow, barely loading pages
Downgraded back to 3.0.0.4.382_50470, all problems solved.