Flash...

[cyb3rnetico]

Good afternoon, I have a Sony Xperia M but the flash has crashed, how can I solve this problem? best regards

[Phy]

1. Settings
2. Apps
3. All
4. Camera
5. Clear data
6. Restart the phone

[Phy]

If clearing the camera app data doesn't work, test it with

1. settings
2. about phone
3. diagnostics
4. test
5. test the camera

[Phy]

you can also boot on safe mode and test if it works, if it doesn't repair the phone with Sony PC Companion

How to boot on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

How to boot on safe mode on Lolipop
1. press and hold the power key
2. once you get the pop up menu 
3. press and hold "power off" 
4. Boot on safe mode should become available

Sony PC Companion
http://support.sonymobile.com/gb/tools/pc-companion/