minver firm isn't in the nordump..u have to take ur model and verify the bootldr offsets/values
to see wich it is from the metldr/bootldr table and then u know 99% the minimum firmware version capable of running" on that ps3..
for the ROS0/1 firmware versions(old/installed)
u can check many ways..
extract the nordump with flowrebuilder, go into each ROS folder and open the "sdk_version" with notepad to verify the firmwares that was installed/is installed
offsets can vary depends on ofw/cfw dump, normally they are at (the ros0/1 versions)
001004D0 ROS0 version offset
008004D0 ROS1 version offset
not at those offsets, just search for "txt" -- SCE -- firmversion = at the 5th one..
NOR Firmware OFFSETS (COREOS)