There's graphics for a card error screen, figure out what triggers it.
An obscure handheld console by TimeTop whose game library mostly consists of knockoffs of NES and arcade games.
The text string "GZ Daidaixing Tec.Electronics Co.,ltd" is present in the header of every game's ROM. If this text is modified or missing, the system will boot up to an illegal card message. However, all known GameKing clones (LTPS Handy Game, 4 in 1 Game Player 2010 Go Go Go, Dot Matrix 5 Game Player) seem to bypass this check.
All known Asian games display Chinese text above the Timetop logo, whereas all games from other regions don't. The text reads "Daidaixing", which refers to the manufacturer.