Here is a little info on PUFF:

The conversion bins we have now are running out of code space room.
Jvvh has for a bit now has this new style of conversion bins he calls PUFF.

With PUFF the BG (back ground) is put into the boot section freeing up the bytes that the BG takes up in the actual bin code itself.
This new style also allows us to go a little bigger in bin size if we need too.
I believe it's from 448 kb to 512 kb maybe even a bit bigger then that.
Maybe Jvvh will confirm the actual size we can go.

With this New PUFF style bin you will need to convert back to 2500 using just the boot60 bin.
As you have knight rider lights load the New PUFF 640 kb bin one time to get you converted to PUFF.
This is the easiest way we have found to do it so far.

Jvvh wanted something to show the peps when changing to PUFF that they will know that they have changed.
So Ukronic came up with a new display that will show on your reciever display screen.
Once converted to PUFF your reciever display at start up will go from b 7 5, b 7 5 to P U F F , P U F F. Pause on F for 30 seconds then come ON.

You can NOT load a normal b75 compressed 448 kb conversion bin to your reciever afterwards and it must be a new PUFF 448 kb conversion bin.

You can NOT load a 448 kb PUFF conversion bin over the b75 conversion bins either.
You must convert using PUFF 640 kb conversion bin first in order to load a New PUFF 448 kb conversion bin.

For now who's ever PUFF 640 kb conversion bin you put on your reciever to convert to PUFF will be the BG you will have embedded into boot section of your reciever.
Don't worry Jvvh says we need to come up with tools to allow you to change BG but that will be in do time.

If you use my PUFF 640 kb conversion bin to convert to PUFF,
Yes you can use other PUFF 448 kb conversion bins done by others afterwards but it must be PUFF style.
NO you will NOT just have to use my PUFF 448 kb conversion bins.
It will just keep my BG on your reciever thats all. Again the BG you will be able to change in do time.

I have my PUFF 640 kb bin done already (Thanks to Ukronic) and it is a 253 bin so it is up and running.
Just wanted to test it out first before I start releasing it to the public.

Everyone will need to eventually change to the PUFF style bins but I will post both sets to give peps the time to convert over to PUFF but again "You will have to eventually do it".

"PUFF"--as you mention, is not a 'full' conversion....not yet, think of it more as 'Phase One' of something Much bigger. This step bascially swaps compression types being used in binfiles. (the rest is cosmetic to this point)
Fwank7 has done an excellent job of -out lining- what to do, and that the 'old' way is almost done... but I must point out that a new (other then PUFF) compression is in testing and saves us even more space...
With the 253 .bin
B-75--after compression was 431kb out of 448kb

PUFF--after compression was 403kb out of 448kb

LZMA--after compression was 352kb out of 448kb (ballpark--it was 35?kb for sure)