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I'm running android 2.3.4(official), If I unlock my xperia mini bootloader, can I update/repair my phone software through Sony PC Companion or Sony Update service??
If you unlocked bootloader and if you will update via PC companion or SEUS you will brick your device... First Relock your bootloader then use PC companion or SEUS 
or just use flashtool to repair/update your phone
How to manually update 2011 Xperias to android 4.0.4 build number 4.1.B.587 & others
http://talk.sonymobile.com/thread/38251
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unrelated topic, if you have some time please check this thread