Can you send me copy of /sbin/preinit (original one)?

I seems that v42 power-kernel has something different in it - checksum calculation of /sbin/preinit in M32GBboot.sh is set for a reason. If you are not able to run it without disabling checksum that means a modified /sbin/preinit and anything can happens now. A standard PR1.3 has no change in /sbin/preinit and checksum should pass in standard PR1.3

Note: you are right about product verification in M32GBinit.sh and I will issue a modified scripts for that.