Wideawake,
They are using UPX to compress all of the rom files before creating the nk.nbf file. This would effectively UPX compress all files stored in the rom, greatly reducing the ROM size. This allows plenty of room to add other apps into the main ROM, saving storage rom and drastically increasing the spead.
I have been interested in creating my own custom nk.nbf, I just haven't had the time. I did a dump of all files and registries from the 2.0 AKU in preparation to do it, at least UPX compress and recreate an unencrypted nk.nbf
If you are talking about creating a custom 2.2 .nbf, then please entertain the thought of UPX compressing the files first. This may work with a custom ms.nbf, but would have less value than UPX compressing the nk.nbf.
Hope this makes since.
-Paul
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