My suggestion is to use the tools from widawakes rom builing toolkit and follow these steps of his procedure before converting to .nbf:
Changing bootscreen.
1. copy your nk.nba file into the directory 5. BootScreen, then rename to nk.fat.
2. Run patchlogo.exe, select nk.fat in the first dialog and your preferred .nb file in the second. Note: If you have a 320X240 image you would like to use, you can use the nb_image_converter_859_418.exe to create a custom .nb file
3. Rename the nk.fat back to nk.nba and convert into a nk.nbf.
As for the bluetooth, i don't have that on my PC, but i've heard bluetooth activesync works. I don't know that it will work for the bootscreen changes, but you are welcome to try
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