This is Merlin’s Asuswrt 378.56 for the ASUS RT-AC68U/R.

-sync latest changes from RMerlin.

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Download (ASUS RT-AC68U/R):
RT-AC68U_378.56_2.trx
Download: RT-AC68U_378.56_2.trx

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Source:
https://github.com/pershoot/asuswrt-merlin
https://github.com/RMerl/asuswrt-merlin

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Installation instructions:

-Flash the .trx through the UI
-After it is completed and you are returned back to the UI, wait a short while (~30 seconds) then power cycle the router (with the on/off button).