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So I have a Qmobile Noir A2, also known as MyPHone a818 in malaysia. And it absolutely is NOT rootable. So now, I'm wondering if I can flash another version like MicroMax A45's to my phone? But it's not rooted so how can I flash another ROM/OS without root? Thanks.

I remove battery, put it back in and I DONT switch it on, it just turns the screen on by itself and starts charging (But the phone is still off) and then PC doesn't detect it...7. Now turn off your Micromax A45, remove battery and put it back(DONT switch it back on).
8. Press Download in the SP Flash Tool window, then When the countdown starts, connect your phone to PC.
9. After it's done, disconnect the phone, remove battery and put it back. Boot the phone into Recovery mode,