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When you changing ROM from one version to other version you need wipe all your data from device.
You should do factory reset and then upload new Whole ROM without uncheck any option. Of course remove sd csrd and sim cards.
You no need use any buttons when you uploading ROM should start it self. Only when you device is stuck on bootloader you need plug device to computer and press power button until SPFT start uploading your device (around 5-10 seconds is the same as hard reset)
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