This forum is for Hardware Development for MTCB Android Headunits. Check Settings->About tablet -> MCU Version. If it starts with "MTCB-" you are in the correct place.
"MTCB" covers headunits from Klyde, HuiFei (KGL), Joyous (Joying is the reseller), GS, Eonon and more resellers and vendors, but you must check your MCU version.
All MTCB-Unit-related forums: Questions & Answers