I just compiled Rockbox for the Philips HDD1630 using Cygwin.
Now, I don't know where to find and how to install the bootloader. I think rockbox.mi4 is the bootloader, but I can't find the "original" bootloader on my device, in order to replace it...
Any ideas or solutions?
//OK! I found a solution myself!
You need to replace System/FWImage.ebn with rockbox.mi4!