Download latest Android Jelly Bean 4.2.2 stock firmware for JXD S7800 16GB game pad from here or here. Download previous firmware from here. Download anothe JXD firmware from here.
Archive: JXD S7800_16G
Model: JXD S7800 16 GB game pad
Image: 20140605 / update.img
Image file size: 281 MB
Platform: Rockchip RK3188Boot version: 1.24
FW version: 4.1.01
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