Sony experia mt27i hangs

see if this helps you out.
Hard Reset SONY Xperia Go ST27i

1. Switch off your phone.
2. Then hold and press together Power button + Volume Up for about few seconds, or until you see menu of your screen.
3. Follow the instructions on your screen, and confirm operations.

How to Hard Reset my phone - SONY Xperia Go ST27i - HardReset.info

or this link.

https://www.google.com/search?q=how+to+reset+a+sony+experia+pm+0090bv+st27i&rlz=1C1AVFC_enGB797GB798&oq=how+to+reset+a+sony+experia+pm+0090bv+st27i&aqs=chrome..69i57.9658j0j8&sourceid=chrome&ie=UTF-8

Hi,

Just long press it and when it is highlighted or prompted drag it to below Recycle Bin.

That's it.

There is an icon at the far bottom right of the text keyboard, looks like a smiley face. Single click in it and you will see all sorts of various smileys you can add to texts.

The white light sounds like it's gone bad. You'll have to replace the entire screen to fix it since the white light cannot seperate from the screen internally.

Hi,
The LCD display is broken. You must change it.
Regards.

re install your os

My sony experia mt25i were hanged and can not tur off manually up to dae...does anyone can help me?

Power off.
Start the phone. when you feel the vibration after the sony logo spam the volume up button like crazy. If the phone boots power off and try again.
This should get you in to Recovery mode where you can choose Factory Reset. Good luck!

Hi,
You will have to wait for the new update.
or take it to an authorised service center and downgrade the software to previous version.

it is asking for the screen calibration.you have to follow the + mark correctly by tapping exactly on the mark.