My personal results switching from
Rogero CFW 4.30 (v1.0) to
REBUG 4.21.1 REX
PS3 Model: CECH-2501A
1- Downgraded
Rogero CFW 4.30 (v1.0) with
REBUG '999' Downgrader 3.55 via
Recovery Mode.
2-
Installed 'Toggle QA' +
Run 'Toggle QA' from XMB.
3-
Dehashed via
Recovery Mode by installing
Rogero CFW 3.55 (v3.7).
4- Verified
Toggle QA key combo from
Network Settings, all good.
5- Installed
REBUG 4.21.1 REX via
Recovery Mode.
So far as another used reported,
Need for Speed Most Wanted (requires FW 4.25) did not work (unmodified), at least using multiMAN 04.09.00 + BD-Mirror + Standard BD-ROM Emu, so I guess I will need to resign games that require FW 4.25+, but that's OK, this CFW is very nice

.
Thanks to REBUG Team for this nice release! I hope to see a REBUG 4.30 REX at some point.
EDIT: Decrypted/Resigned EBOOT.BIN from NFSMW for FW 3.60 and loaded just fine
EDIT2: I know is offtopic, but for those wondering how I decrypted/resigned, here you have:
Decrypt
scetool.exe --decrypt EBOOT.BIN EBOOT.ELF
|
Encrypt
scetool.exe -v --sce-type=SELF --compress-data=FALSE --skip-sections=TRUE --key-revision=10 --self-auth-id=1010000001000003 --self-vendor-id=01000002 --self-type=APP --self-app-version=0001000000000000 --self-fw-version=0003006000000000 --encrypt EBOOT.ELF EBOOT.BIN
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Note: Remember to store a backup of the original EBOOT.BIN just in case.
SeeYa!