[Q] How to unroot xperia MINI[ST15i]?

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Hi all!!

I already root my mini but it can't connect WIFI so I need to unroot to original.

I try to find out the way to unroot in there but I can't find any accactly way to unroot it.

Any one know how?? Pls help.

Ps. I also can't uondate my Build Number too

here you can finde what you need.

http://forum.xda-developers.com/show...1&postcount=33