I just did it. All fine so far.
Can you post a direct link to the firmware? 3626 is not showing for the RT-AC66U on the official Asus support page. The most recent firmware showing there is 3602. Although I'm probably going to stick with 2524 as it has worked perfect for me. The only upgrade I see in 3602 that I might be interested in is "Click the lock icon in client profile to assign fixed IP for client."
Thanks for the feedback. Just to add to the database here, had you tried 3602? What is your hardware version?
Yes, I had used 3602 without any problems either. It was a big improvement over 2524, which gave me all sorts of niggling little problems. In fact, I only used 2524 for a day before going back to the then current Merlin release.
I'm one of those guys who has to try every new release, official and Merlin, as soon as it comes out.
I don't see 3626 update for the RT-AC66R only the 3602 update.
Firmware 3626 runs slower than 2524 through wireless. I updated today and prior to update I was getting 20m down 20m up now I get 14m down and 5m up.
Is this with a reset to factory defaults and manually setting up the router again? Preferably with a new SSID?
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