I am running 17977 firmware. The micro is verified as a usb hub and has been flashed with the correct file.
So you're past step 2:
1. Get all the needed hardware (compatible board & USB OTG cable with power).
2. Get it flashed correctly with ...
Would it be possible to make a Leonardo/Micro hex file for the 12940 firmware?
Here you go.
how can I damage my phone to get a free replacement without physically breaking it
If you're intent on committing fraud just to get a new phone, I think you should be able to figure this out on your own...
By the way, it would be great if only people take time to read just a few page back before asking the same question again and again...
Sadly, the people who need this face-palm level obvious advice are the exact ones who will never read it....
May I know is there any way to overclock??
Please please read at least the last 20 (at a bare minimum) messages or so before posting a question answered more times than I can count on my fingers and toes...