[Q] no root anymore after re-run unrevoked

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http://forum.xda-developers.com – Hi all I've rooted my wildfire last year using unrevoked and all went ok... now I've used unrevoked another time to flash an updated clockworkmod instead of my actual almost because I can't charge my phone when it's off because of an old bug in cwm. After running unrevoked the phone boots but I've lost superuser app and unrevoked itself fails with something like "cannot get root, firmware too new?" and if I run "su" from terminal emulator I got a "permission denied". The cwm is still version Any idea? (HowTos)