Rk3188 Android 5.1 Firmware ((free))
Updating to Android 5.1 Lollipop provides several notable improvements over the older KitKat or Jelly Bean versions:
The general flashing process for Rockchip devices is standardized. rk3188 android 5.1 firmware
Boot your device into its physical Recovery Menu and perform a manual "Wipe Data / Factory Reset" and "Wipe Cache Partition," then reboot. Updating to Android 5