Just got the router now, can confirm that flashing from stock firmware 1.0.2.28 to R7800-owrt1907-r10997-5b9b833f8c-20200410-1716-factory.img worked flawlessly from the stock web ui without the need for tftp.
Just got the router now, can confirm that flashing from stock firmware 1.0.2.28 to R7800-owrt1907-r10997-5b9b833f8c-20200410-1716-factory.img worked flawlessly from the stock web ui without the need for tftp.