PXE Boot - Installation system files...

Question

Hi there,
I need some clarity on the following please.
I am applying the October 2012 ZENworks Imaging Driver Update.
Before the update all works fine and it goes through the pxe boot process as follows.
Pxe boots fine and I get the pxe menu.
Once I select a menu option it goes through a few checks, usb devices etc.
then Sends the DHCP request and lastly
Loading installation system.....(55392 Kb)
I get the #prompt and can image fine.
After the update which I do by backing up and replacing the following pxe files.
srv/tftp/nvlnbp.sys
srv/tftp/boot/settings.txt
srv/tftp/boot/initrd
srv/tftp/boot/root
srv/tftp/boot/linux
I get the following.
Pxe boots fine and I get the pxe menu.
Once I select a menu option it goes through a few checks, usb devices etc.
then Sends the DHCP request and lastly
Loading installation system.....(15000 Kb) --> This file is a lot smaller.
Where do the above files come from..?
Then I get the #prompt and attempts to start the imaging process crash.
Maybe there is something I am missing in the update.
I did the pxe file updates. Is there anything else that should be updated for the pxe boot to work ?
As soon as I revert back to the old files, I get a complete download of the Installation system.
Thanks

Answer 1

Thanks I tried that, but sadly it did not work
The drivers work for the new hardware model, but the installation system that is downloaded is only 15000, then imaging crashes.
These are the only files that change between the working and not working system. Keeping the old root also did not work.
any ideas anyone ??
srv/tftp/nvlnbp.sys
srv/tftp/boot/settings.txt
srv/tftp/boot/initrd
srv/tftp/boot/root
srv/tftp/boot/linux