AtGames Legends Flashback
Using a USB to UART adapter with male to female jumper wire you can dump all of the included games. Even though you can, there is no soldering required to do this.
First, format a USB stick to FAT32. (Not sure if it’s necessary, but since it worked on the Super Retro-Cade, I formatted it with the partitioning scheme MBR, using Rufus.)
Use PuTTY (or other terminal programs) and set the serial port to COM (and the correct USB port number. COM5 in my case). Baud rate/speed to 1500000.
When the Linux command prompt starts up type in root and hit enter to get root access. (Not sure why, but I needed to do so before the login screen showed up.).
The games can be found in the folder called rom and the SD-card inside the folder called media. (/media/usbhd-mmcblk0p1/). You can make a folder at the root of the SD-card called GAMES e.g. and copy the content from the rom-folder into the SD-card: cp /rom/* /media/usbhd-mmcblk0p1/GAMS, or use the cp -r command to copy the whole folder instead (that way you will get the sub-folders copied over as well).