Lost ringtones

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Hi,  I have a Sony Xperia Miro.  I've lost all my ringtones.  I think this is because I cleared all music & pictures from the internal memory.  Now my phone won't ring & neither will the alarm clock.  When I try to assign tones Sound Picker just doesn't respond.  When I look in the memory area there are no tones shown.  How do I get them back? If I can't get them back how do I get new ones?

I'm not an experience smartphone user.  Please help.

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[Uliwooly · Accepted solution]

Repair your phone with

Update Service (SUS)

http://www.sonymobile.com/gb/tools/update-service/

http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

Don't forget to give Kudos 

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I've got my ringtones back.  I'm so grateful.  Many thanks uliwooly.