Windows 8 iSCSi Boot - INACCESSIBLE_BOOT_DEVICE

[NiKiZe]

The install process is 1st stage: winpe, reboot, 2nd stage: winpe from install.wim, reboot, 3rd stage: finishup.

My guess is that it fails on the second step, the reason for it being that the nic drivers didn't actually install (normally the network drivers are install at the end of stage 2) for iSCSI to work it must be installed in the image att stage 1.

I don't know how this should be done, or if it is the real culpit.
Could you test doing an installation to physical hd and after the first reboot press Shift+F10 Type compmgmt.msc and check if the nic is installed.
If not you atleast found why.