thank - was able to flash diags - still rebooting into diag mode doesn't work out, stuck with the tree after triggering diag in mfg_tool.. Strange, isn't it?
G:\fastboot>fastboot.exe flash diags mmcblk0p2_ssh.img
OKAY [ 4.852s]
OKAY [ 5.413s]
finished. total time: 10.265s