Same issue here, no means of upgrading beyond 2.5.1.22, tell me 2.6.2.104 is available but using app, Rui, manual update via Rui or TFTP don't work, router goes offline for about 30 mins every time with pulsing white lights and eventually back to 2.5.1.22, I even paid £54.99 for support but this was only when it looked like the router was bricked so have asked for a refund. Router still under hardware warranty so not sure how to proceed as not currently fit for purpose if it can't be updated.
