OK,

It's not an upgrade. It's a new kernel. An upgrade includes things like a ramdisk image, player software etc. It needs to be applied using the download.c program or upload included in the logoedit package by Tony Fabris.

Go here for a description of hijack and a link to the logoedit package.

Then run:
upload.exe <patch file> 10000 <com port>

Where <patch file> is the .zImage file and <comport> is just a number i.e. 1, 2 etc. There is no need to rename the file.

The player must be on the AC power supply and you need the supplied serial cable connected to the unit.

HTH