How to install the RetroFW v2.2?
In order to make the RetroFW work in your device, you need download the correct firmware image before you flash it.

The devices differs in SoC revision (JZ4760(A) or JZ4760 B) and the LCD module being used. Download the firmware type according to the table below.

If there's more than one type suggested for your device model, try the first one listed. If it doesn't works, try the other one.
Don't worry: It will not soft brick your device. Just flash the SD card and try again.

Which firmware type should I use?
Check the type according to your device:

Device	Firmware type
Retro Game v1.0	Type 1A
Retro Game v1.0 S	Type 1A or Type 1B
Retro Game v2.0	Type 2A
Retro Game v2.1	Type 2A or Type 2B
Retro Game v3.0	Type 3B
Retro Game Plus (60Hz)	Type 3B
Retro Game 300	Type 3B (Dim Screen) or Type 2B (Bright Screen)
Retro Game 300 IPS	Type 5B
Retro Game Plus Anniversary	Type 5B
Retro Game Plus IPS	Type 5B
Retro Arcade 4.3v1.3	Type 4B
LDK (Horizontal)	Type 2A
LDK (Square)	Type 2B