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How can replace power button flex for Xiaomi Mi Note / Pro. I already the parts for replacement.

Unfortunately, there is no ifixit guide specifically for that. But this guide should show you most of it: Xiaomi Mi Note Micro USB/Microphone/Virtual Keys light/Vibrator Replacement This non-ifixit video may also be of use: https://www.google.com/url?sa=t&rct=j&q=… Hope this helps!