Rogero, già famoso nella scena PS3 per il suo omonimo backup manager, ha ieri rilasciato un nuovo Modified Firmware per 3.55 che vi permetterà di fixare l'errore relativo ai Trofei che vi si presenterà sempre ogni volta che proverete ad avviare un qualsiasi gioco sul CF 3.55 dopo aver effettuato un downgrade da 3.70.
Questo nuovo Modified Firmware si è rilevato necessario perché qualunque altro Mfw o CFw si provasse ad installare dopo il downgrade da 3.70 avrebbe portato al brick della console (provato di persona dallo stesso Rogero!). Questo pare sia causa di un LV1.self non patchato "normalmente" (perché fino ad oggi non ce n'era bisogno, ovvio) nei Custom/Modified Firmware in circolazione al giorno d'oggi e che quindi non può essere adatto al Firmware "ibrido" che si crea dopo un downgrade con Progskeet o altri metodi.
Queste le parole del coder che accompagnano la release e spiegano meglio tutto il problema:

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Last night I had the chance to try and downgrade a Slim Ps3 (JSD-001 board with Spansion NOR) version 3.70 to CFW 3.55 using Dospiedra's downgrade v2 patches. I managed to get a clean dump of the NOR using my ProgSkeet (latest QT port used), created a patched Downgrade.bin image using the 6 patched files from Dospiedra and a hex editor, then I flashed the image to the PS3 NOR, dumped the NOR another time and verified that all was written fine. Then I continued with the normal downgrade procedure, go into service mode, update using the 3.55_no_check.PUP, then exit service mode and all was good, it was back into CFW 3.55. Here the problems started, I tried to start a game and I got the famous Trophy error, so I decided to update it to my personal Modified Firmware, so I started the update and after installing the firmware, the PS3 turned off by itself, I tried to turn it on again, It turned on for almost 2 or 3 seconds then turned off completely (No Screen Output, No Red Led either) so I knew-ed at this point that the PS3 was Bricked N.B: this was never mentioned in any of the downgrade tutorials floating on the net, although this is a very important point to warn the users who are downgrading their Ps3 machines not to update using usual Modified firmwares unless the firmware have the LV1.self file patched to Disable all checks, anything else will result into a Bricked PS3, and this is not good at all especially if the Hardware flasher used to downgrade was removed from the Ps3's NOR or Nand Flash. After doing some research and discussing the issue with my friend eussNL <-- a wiki by himself I realized what happened to the Ps3, after the downgrade procedure, the machine's syscon still had a version > 3.55 (3.56 or higher) and this needs a Patched LV1.self (checks disabled) in the NOR for the PS3 to be able to boot fine, and when I updated it to my own MFW, the LV1.self file in the NOR was replaced with a non-patched version (checks enabled) and the PS3 detected the higher syscon version (3.56+) and Bricked. To Fix it, I had to re-flash the NOR again with the patched Downgrade.bin image (to get rid of the un-patched LV1.self) then the Ps3 was fixed and booting fine again. N.B: in case you're using ProgSkeet, make sure you are using the Latest released flasher (QT port) as of 11 Sep 2011 from this link: WinSkeet40000.zip This one have Preset parameter values for each NOR type, I used it on Win7 and it flashed my Spansion NOR just fine. At this point, the Ps3 was working again, but the Trophy problem was always there, so I prepared another Modified firmware with 3.70 spoof, Privacy Patch and this time the LV1.self Checks Disabled (the patches were provided by eussNL too so Credits here goes to him), then while still having Progskeet soldered to the NOR flash, I updated the Ps3 with the new MFW, everything went fine, and it rebooted fine into the XMB, did some tests and the Trophy problem was gone for good and all games working fine. For all the users who had successfully downgraded their PS3 machines to 3.55 again, I share with you my MFW with Lv1 Checks patched to bypass the 3.56+ syscon version and prevent any brick after updating to it, and to get rid of the annoying Trophy problem encountered after the usual downgrade procedure.

fonte:ps3-ita