OK… I think I may be in a similar situation here 
I tried using reform-flash-uboot emmc to update uboot (see my other post) and now I’m in a situation where the Pocket Reform seemingly powers up (OLED comes on, keyboard backlight comes on), but there is no screen output. The uboot update appeared to run - downloaded flash.bin and flashed it - but now I have no further life.
Looking at section 8.1.2 Serial Console of the Handbook, it seems to say (I think?) that I can use a USB-to-UART adapter and connect
J17
- 1 S2 UART2_TXD, connect to RX of your adapter
- 2 S2 UART2_RXD, connect to TX of your adapter
- 3 S2 GND, connect to GND of your adapter
I’ve tried this but I’m not seeing anything on the serial output from my other machine. I’ve also tried wiring according to the actual pinout and pins on the board to the relevant corresponding pins on the UART adapter. I’ve tried with and without a base image on SD inserted i.e. it seems as though boot from flash and SD are both broken in some way.
I unfortunately don’t have a Reform2 or any other SoM adapters. Is this something that requires the bodge wiring and use of the OTG port as described here, or should this be working over UART? Any other ideas?