If you hold he ENTER button next to the 0 until the player turns off, the player's EEPROM will maintain a multi-region setting regardless of what firmware you install after the fact. That is untill you put StM V3.1 back in and hold the CLEAR button next to the 0 until the player turns off to restore the original EEPROM multi-regional setting. If you send interlaced 480i NTSC video via Composite, S-video, or Component, the black level shift drops from 7.5 IRE to 0 IRE, allowing for deeper blacks. If you have trouble with darker scenes, go back to one of the Pioneer original firmwares. If you have a TV that can accept raw NTSC and Pal video, set TV Type to Multi. If not, set it to whatever system corresponds with your TV. The DVD Fast Start feature allows most movies to start without disc menus. If the movie doesn't start, press TOP MENU and start the movie by making the appropriate DVD menu selections. Prohibited User Operations has been partially disabled so you can change the audio and subtitle streams while certain movies are playing which normally didn't let you do this. If you're into compressed audio and video files such as AVI, DivX, MP3, MPEG4, WMA, and WMV, the StM V3.1 can display longer file names than the Pioneer original firmwares. You can switch back and forth between firmwares as much as you want to. I do it all the time with players that cost between $200 and $500. I luck out every time! Another thing that's been reported by the experts to work is success when installing next-generation DV-410V firmware on this model. By doing that, you just increased the range of the Gamma control. Right now, you can only choose between High, Medium, Low, and Off. The next-generation DV-410V firmware changes it from -3 to +3. In order for the DV-400V to think it's a DV-410V, you must rename a DV-410V firmware file. For instance, change YJB8A13A to YGB8A13A. From now on, the 400 will think it's a 410 and recognize YJB firmware files. DV-420V firmware will safely load in the DV-400V, but you might lose USB until you go back to either 400 or 410 firmware. Well, I said a lot. I hope you found it useful. Good luck!