Luci, you kinda got something wrong. It's not QA toggle you gotta use after downgrading but deshashing your PS3 to reset syscon, in case you don't do that there is a high risk of getting a brick from CFWs without Lv1 check. At least for Rogero's CFW, QA Toggle is mostly used in case you get the OFW 4.40 required glitch
OK, updated to 4.21 v1.09. Tried to then downgrade back to 3.55 using above mentioned method. After installing and running 4.25 downgrader, I went into recovery to install 3.55 cfw. Problem came up saying I need 4.40 or higher firmware. Now Rogero Logo doesn't boot up with PS3 just regular logo but I still have Multiman access. Firmware still says 4.21 as well. Help would be appreciated but please take your time, thanks in advance!