Download Android Lollipop 5.1.1 stock firmware for F89S tablet from here or from here.
Firmware details
Archive: f89s
Firmware image file name: update.img
Platform: Rockchip RK3126
Archive size: 274 MB
Firmware details
Archive: f89s
Firmware image file name: update.img
Platform: Rockchip RK3126
Archive size: 274 MB
Boot version: 2.25
Firmware version: 5.0.02
Build number: rk312x-userdebug 5.1.1 LMY47V eng.wangq.20150917.173933 test-keys
Model number: ATT_09
SDK version: RK30_ANDROID5.1.1-SDK-v1.00.00
Firmware version: 5.0.02
Build number: rk312x-userdebug 5.1.1 LMY47V eng.wangq.20150917.173933 test-keys
Model number: ATT_09
SDK version: RK30_ANDROID5.1.1-SDK-v1.00.00
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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