The board is accessible from the top, remove the keycaps and find six screws, open them and carefully slide the board out. Note the USB-C port sticks out a bit and is in the way for the board to go out, you'll need to tilt it.
The board has a BYK903 marked chip which I have yet to identify.
There is an ISP port nearby with 6 pins that can be used to read and write the firmware with https://github.com/gashtaan/sinowealth-8051-dumper I haven't tried but looking at other boards on the net with a similar configuration it's a safe assumption.
I didn't identify any way to reset the board by pins so the only way to do it is with the USB protocol, this can be done with https://github.com/carlossless/sinowealth-kb-tool with which I successfully read the firmware but didn't