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Whatever you do, first save the out-of-the box firmware. You may need it to restore your device after a failed firmware upgrade. The procedure can be found somewhere in the Android Developers section here. There's even a video for it.
(Scenario: I have a T61B clone. I can flash every Boyue T61B firmware on it, but afterwards I have to write over the first two partitions from the original factory firmware, or the touchscreen won't work.)
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