I just did the hack on my N510 and it worked fine, there are a few points I'd like to make:
:arrow: 1. The instructions are a little off for my MD, I had to use FF not vol + to get to manual, then play. The FF once more to go to Lazer and then vol + to go to F Code. It's a very confusing menu system, I think that is on purpose to prevent people (like us) from being funny buggers :!:
You can fool around going up and down the menus till you get a feel for them as long as you don't press vol -/+ when you have a hex code on screen, they're the ones with the changing letters.
:arrow: 2. After switching on the extra settings, the 2 arrows in the top of the LCD for showing sound 1 & 2 on or off now don't work at all, in therory they should turn of when you pick EQ custom 1 or 2 but it doen't happen. It's not a real problem just a bit of a gripe, I would like to see when I have an EQ on or not.
:arrow: 3. The LCD screen itself doesn't show the whole display and therefore you don't see some of the extra settings, such as 2/3 of the EQs level adjusts, you only see the first 3 level sliders. This goes for the timer, you only see the hour and not the minutes. Would getting an LCD remote fix this? Has anyone tried another remote with a 510? I got one that only has volume and tranport buttons, it's small though so i'm happy with it.
:arrow: 4. As DS wrote, the custom EQ settings seem to disapear, it's when you take out the battery, leading me to sudgest you'll loose the PDMs as well, so you have to keep the battery charged. Sorta like the way people use mobile phones some times by chaginging them and still leaving them on to recieve calls.
Hope this helps everyone, and I hope someone can tell me if an LCD remote is compatible. The text segment of the 510's screen can only show the first 6 characters of a menu setting, so if anyone knows how many text segments a remote's screen has it would help.