You need to be careful on the E40, there is a combination of BootBlocks and OS's that will brick them. Check the message again because I am sure EFILive will not allow the flash to proceed if there is a bootblock mismatch.
On the latest software...he could be using a really old version that doesnt.
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.