Thanks for the reply! I am aware of the dangers of working with bootloaders and custom firmware. I’ve successfully compiled and flashed my own firmware on the AR750 which was a huge factor in my decision to purchase the B1300 to replace my home router (though it was helpful that the AR750 was already running a relatively recent version of LEDE).

I don’t own a UART serial connector, but I don’t mind getting one as I’m sure it will be helpful in the future. Does anyone have a link to the documentation where I can find the pin layouts for GL-Inet routers (specifically for the B1300)?

I’d still love a response from one of the GL-Inet devs. I’m a little bit worried about flashing anything on this router without a working recovery. I recently tried flashing the stock firmware from GL-Inet (over itself since the router still boots the stock firmware and factory resets normally) via Uboot WebUI, but have the same error. For some reason Uboot WebUI resets the connection before I can upload any file. I’ve tried with 2 separate computers (a laptop and desktop) and 4 different operating systems (Mac OS Sierra, Mac OS Snow Leopard, Ubuntu Linux, and Windows 10) all with their firewalls disabled, Firefox and Chrome (fresh profiles no extensions enabled), but still the same error.

Is it possible my router shipped with a corrupted Uboot? Purchased it from Amazon and still within the 30 day return period. Wondering if it would be better to try a fresh unit.