Hello @jock,
I have R29 board and want to help out with the no video problem.
Here's stuff i gathered so far:
* CPU is RK3229 (Based on what Android says it is. Couldn't remove heatsink to physically check, it's "glued" on really tight, didn't want to use excessive force to not damage anything).
* On WiFi chip is written S9012P but Android says it's AP6210 (Neither has Linux driver so whatever).
* Standard 1GB/8GB RAM/storage setup.
* Photos of board front, back
* Device tree dumped from running Android
* dmesg of Android
* dmesg of multitool
I've noticed multitool has troubles reading storage too.
Let me know if you need anything else.