We should use a checksum to protct the incomplete byte code.

[wycc]

If the byte code is not downloaded completely, we should drop it.

[wycc]

If we fail to update the complete byte code, the VM should not execute the byte code at all so that it won't create wired situation.

[nielsreijers]

The upload process already checks for missing packets and will let the master know if any gaps are detected. Zwave already includes a checksum to verify the contents of the packet.
If an incorrect bytecode is uploaded, for instance by turning off the node in the middle of the reprogramming procedure, it will start to run the corrupted bytecode, but will most likely just crash immediately. Either way, the node will still listen to the radio so it can be reprogrammed again.

This checksum would still be good to have as an extra precaution, so I won't close the issue yet, but it does seem to be a nice-to-have at this point, so I'll put it in "won't fix" instead for now.