Follow-up to report r-rxh32hs4 (same TECKIN TC100 unit, ipctool YAML re-sent): photos of both sides of the board.

- Front (lens side) is marked "YZ01-V1.0.0 2020-5-15". The earlier report said WVC3310S2_V5.0 from another photo: either the board carries both markings or that photo was of the second TC100. To be confirmed.
- UART: three through-hole pads marked TX RX GND, bottom left of the front side (ttySAK0, 115200 per the U-Boot env).
- Wi-Fi: LB-Link module BL-M8188FU3 (RTL8188FU, USB).
- SPI NOR: SOIC-8 marked XMC on the back, top left.
- Back also has test points 1V8, 1V2, 3V3, AVDD, DCVDC and four pads GND DP DM 3V3 (USB) under the SD slot.

The owner can capture a boot log from the UART and test builds on a second unit.