or... you SSH into a working SBC and use it's spare UART pins to ttl into the non-working SBC...
Likely to be one of the most silly things I've ever did with an SBC.. But hey, it works... (at least @martinayotte will like it. )
do we have UART2 and UART3? at least on mine (4.14) we use UART3... @TonyMac32? Or was it back then when we used UART2? Can't remember anymore..
Its a VT100-Webpage-Terminal on a ESP8266-Microcontroller which opens a Accesspoint.
You could connect via this VT100-Webpage-Terminal to the TTL-Port of the ESP8266.
TTL-Connection is done (like allways in TTL-Connections) with RX,TX and GND
I connected my Orange Pi R1 via TTL and 115200 Baud and could "work" at a (max.) Terminal-Size of 80x25
(80x25 is max. in the downloadable binary - if you do compile by yourself mor is possible.... 132x50 would be fine )
So if you have a misconfigured Network-Connection (missed the /24 in the IP of the server in nmtui) and you dont want to use a USB-serial-Dongle because every Dongle wats its own driver - here a second solution