Before I move, on status update on getting "Debug Settings" on OFW 4.00. Its still a bit buggy, so more work needed there.
I've managed to put my efforts into a .pup file, which should make the installation of my mod much easier. Download here http://depositfiles.com/files/lgx485sqa
Also today I was on another site where user DeViL303 had released a beta of his XMB File Manager (substitute for Install Package Files, but a lot better) and DeViL303 theorized a FW 4.00 port was possible. So I took on the role on making the port for FW 4.00 and after posting it on that thread I integrated it into my firmware.
So now I've upgraded my firmware mod and put into a .pup.
Here's some new installation instructions(much shorter, I know
1/Be on a firmware 3.55 or less
2/Install the .pup through the XMB (Make sure you have a working hardware flasher as there is no other way to downgrade)
Remember only retail signed .pkg can be installed with this. Have fun.