[Q] Accidentaly changed Google Play ID and lost links

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http://forum.xda-developers.com – I was testing Titanium Backup and create a .zip file to flash while in recovery. When I've booted the phone, it says if I want to restore back (at least I've thought I've read this...) my ID. I answered yes. Now, all my apps disappeared from Google Play. I've lost all my links and wouldn't be able, in the future, to update paid apps... I've restored a nandroid backup but it did not solve anything... I've tried to restore the market links using Ultimate Backup Pro but I couldn't... Is there anybody who can help me! (HowTos)