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Firmware for RT-AC66U

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I was planning to upgrade my router with the Merlin firmware, but didn't realised that this model is not supported any more.

Asus stock firmware ( is few moths newer than the Merlin version (RT-AC66U_380.70_0-2).

Is it safer to stick with the stock firmware, as it got some bug/vulnerability fixes?

Or can I use RT-AC88U_382.1_2?
Another vote for John's fork!
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John is due for an update, he has been away awhile though.

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