Hi schpeltiger! On the off chance you can see this - is there any way you could contact me on helping make this work on mine? I bought one recently after rediscovering Rockbox and wanting a player I could have some fun with, if you can let me know! Thank you.
UPDATE, especially in the event anyone else may be able to help!: I decided to make a USB Linux Stick to try out sendfirm there - I got a little farther but still wasn't able to send the bootloader.
./sendfirm64 firmware_zen_xfi_v1rc.nk
libmtp version 1.1.3
Device 0 (VID=041e and PID=4162) is a Creative ZEN X-Fi.
error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to initialize device
No devices.
Thank you to anyone who may know how to help!
