The phone contains modified software can't update. Any solution?

I have sony xperia arc s lt18i when i connect it for software update its give msg The phone contains modified software can't update. any solution for that?
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Let us know how you get it on
It seems that your bootloader is unlocked
First relock it by flashing this file using flashtool http://www.mediafire.com/file/g1b5j712ajx4yjd/Xperia_Relock_bootloader.ftf
And then use pc companion to update
Or directly install as nolramlb suggested
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