PS3 4.93 SEX Ps3 - Unlock code for demo mode restrictions?Any reverters?

[Mythst]

Hi all, long time PS3 CFW user , (since psp-news.dcemu times) but this has me stumped. I bought a slim ps3 3004b -it's a kiosk unit and it has demo mode restrictions. It needed restored after a failed attempt to install standard fw(it demands SEX updates) so I installed the 4.93 SEX firmware to it to restore It . No demonstration codes work (that I have found). Can anyone dig into the fw to see it ? I also tried hard to make a reverter with no success. Just constant errors in MFW likely key related issues .