Without a hardware flasher there is nothing that can be done. the 3.56 JFW could be downgraded from just like 4.40 CFW's but never 3.56 OFW. Till you find someone you trust or man up and grab a flasher for $70 and do it yourself not much more you can do, 3.56 or 4.40 doesn't matter what OFW you are on past 3.55 without hardware is never going to happen.
PS3 CECH-2501A [CFW] & CECH-3001 [OFW]/ PS2 SCPH-3901 & SCPH-7501/ PS1 SCPH-5501
Mod Cobra 4.46 v7.00 w/ E3 Flasher [CFW] & Cobra ODE 4.50 [OFW]/ Mod HDD-OSD [Phat] & Modbo 4.0 [Slim]/ Mod MM3
HDD 1tb [CFW] & 640gb [OFW]/ HDD 640gb & OPL v0.92 w/ 1.5tb SMB