@Riffnugget, this is a very old pre-CFW thread. The downgrade being mentioned is to OFW3.41 or less and won't work on any OFW 3.56+. Sorry.
Oh.. well I thought he meant downgrading a ps3 slim using the E3 flasher... see my ps3 slim CECH-2002B is running 4.11 and can be downgraded to 3.55 using e3 flasher... I just thought he could do that for me
The news from E3 and what develops might change all that. Keep your fingers crossed!
More like an upgraded CFW!
If you read what E3 is proposing 'between the lines', it seems that they might come out with a new dongle and say a 4.11 or 4.20 CFW.
What appears to be uncertain is whether or not you would need to be on O/CFW3.55 before you 'upgrade' with E3's CFW.