Why are you updating from Rebug CFW to Rogero CFW first place?? Rebug is the most reliable and stable CFW out there!
Try formatting your HDD on your PC and re-insert it in your PS3, it will ask you to re-install the system software, re-install Rebug 4.30.2 or Rogero 4.40 v1.03 if Rebug 4.30.2 doesn't install.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!