When you hit the Firmware –> Upgrade button, you will get an error that says “Please make sure all necessary images are checked to be downloaded for “Firmware Upgrade”!”. If you look closely you’ll notice that FAC image wasn’t loaded.
To load FAC image, simply double click on it and load the FAC image file which is also in the target_bin folder as shown below
Now that all your images have been successfully loaded, simply hit the Firmware –> Upgrade button, switch off your device completely and connect it to a USB port and the flashing process should start immediately.
The status bar should show flashing progress in different colors and when it’s finally done, a big green circle will pop-up on your screen.
Congratulations, you’ve successfully downgraded your Lenovo Yoga 8 Tablet from Android 4.4.2 KitKat to Android 4.2 Jellybean.
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