Unlikely, remember debug won't even install on a retail unit. Mixing retail and debug updates and then attempting to install may even brick your unit. Wait for Rebug by evilsperm and cyberskunk.
Originally Posted by Theory
STOP! Before you ask questions... READ the first post! RTFFP = Read The F*cking First Post
Yes, A 3.55 "jb" (cfw) is available, no >3.55 "jb" or cfw yet.
Yes, A 3.55 downgrade is available. But not to lower than stock firmware! (What it came with)
No >3.55 downgrade is out there yet.