2: E3 flasher Fast dual boot and downgrade OFW4.11 to 3.55 successfully, it's same way as downgrade 3.73 to 3.55.
We suggest user upgrade to OFW4.11 and then downgrade to 3.55 from now on. And don't forget backup your OFW4.11 bios well .
3: Downgrade to OFW3.41 from CFW3.55CHECKOFF successfully, tested by E3TEAM.
Now you can enjoy any 3.55FW by this way (downgrade to OFW3.41 and then upgrade to 3.55, include JB2CFW3.55, OFW3.55 and others). Click here to download manual.
tthoughts - Cobra-USB dongles owners with 4.11 BC models might have a reason to look into downgrading their console now. I hope someone can confirm that Cobra-USB will work after downgrading. I may go out and pick one up if it is truly possible.