AR300M brick and..recovery attempt

Hello, another incautious user here.
I was upgrading the uboot with an image found on the github repo of GL.inet (by using http://192.168.1.1/uboot.html), but after some minutes the router had all three LEDs steady on, and it does not show any connection to my NIC.
Tomorrow a USB to SERIAL adapter is shipping home, but meanwhile I thought to register here too…
I don’t think the connection to putty will deliver any info. The box seems totally fried.
Will report back, but I’d like to know if there is a way to flash the eeprom…
Thanks for your time,
Gabriel