How to reset flashed phone please?

Hello guys, a couple of years ago I had gotten a galaxy S3 from a friend who was on a Sprint network but I needed it to work with Boost so a local guy "flashed" the phone for me to get it to work with boost. I just switched to another phone but I can't locate that guy anymore so I'd like to know how I can reset the flashing which was done please?

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First remove the battery and put it again to the place. Now Press the up volume button and the middle button and top power button. now Wait till the android boot menu appears. Then use the volume buttons to select factory reset and press the ENTER button , it will reboot. hope this will help you

Ok, thank you very much Joe, any way for me know for sure that it worked?

Originally Posted by mikehende

Ok, thank you very much Joe, any way for me know for sure that it worked?

You have to tried it with your phone, i have done this with my Samsung phone.

Originally Posted by Joe123456

Now Press the up volume button and the middle button and top power button.

Hi Joe, sorry I only around to this now but my SIII does not have a middle button, only a volume on the left and a power button on the right, can you tell me which phone you have please?

I have Samsung galaxy s6 edge. Which has power button on the bottom center.

I think we both have the same layout, not sure I am following your instructions properly so let me go through again. With the phone powered off, I remove and put back in the battery then I press on the volume button then the middle button which the settings button located in the middle of the bottom part of the phone then I power on the phone, is this correct please?