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Re:A Xilinx ZYNQ Linux FPGA Board for Under $20 by rjsw on Saturday December 12, 2020 @03:46PM (#25401543)
One of the comments links to a GitHub page [1] with some reverse engineering info on one of the boards mentioned.

[1] https://github.com/xjtuecho/EBAZ4205

Re:A Xilinx ZYNQ Linux FPGA Board for Under $20 by xony on Saturday December 12, 2020 @04:50PM (#25402069)
7 months old video ,this looks like same board. Now they solder SD card https://www.youtube.com/watch?v=b6g5tNZZnVc