from Hellcat:

H E L L C A T s - R e c o v e r y - F l a s h e r
========================= ========================= =====
* recover semi-bricks * up-/downgrade your CFW *
* flash *ANY* CFW directely to 3.71-/4.01-/5.00-M33 *
* backup/restore firmware flash (not NAND dump) *
all without Pandora
========================= ========================= =====

Last Update: 24.10.2008 - v1.41

* Updated flashing of 5.00-M33 to 5.00-M33-3
* Fixed backing up of CFWs with the 1.50 AddOn installed. Those backups have been incomplete (the 1.50 kernel wasn't included in the backup), now everything is propperly backed up.
* Fixed a bug when the program got a bit confusored when stumbling over a 150.PBP while caching the updater modules (150.PBP is now skipped, there are no modules to extract in there anyway)
* Added a warning about not resetting/formating flash1 when flashing a different FW than currently installed (keeping flash1 by flashing a different FW version can cause confusion for the new FW)