JET: Urgent, cannot boot T3-1 from my JET, media 10_08_11 (boot net or boot net - install is failing

hi all

I have to re-install a new delivered T3-1 box with Solaris 10 update 10 (10_08_11 media) from my jumpstart environment.

T5140 reinstallation over same JET went fine but T3-1 is not bootable at all from network !

does anybody knows why T3-1 is not booting over net even if a T5140 is fine ??

message on console T3-1:

boot: cannot open kernel/unix

My jumpstart environment looks like this:

root@b0d0i602 (I_JET_U310):/root 0
# pkginfo | grep -i jet
application JetEXPLO                         jet explo product
application JetFLASH                         JET flash product
application JetISO                           JET ISO product
application JetJASS                          JASS product