ASUS RT-N56U Firmware Version 3.0.0.4.376.1665

[Grisu]

ok, you wrote first time 3632 not 3626 like in the second answer, so I thought to need exactly this one.

E.g. to update clock you need a special file as well.

 

[maksokami]

If anyone wants to upgrade to 3.0.0.4.378.4850, be carefull. This firmware looses all port-forwarding settings every once in a while and the only way is to restore them manually. Configuration re-load doesn't work. I had to downgrade.