Everything went ok apart from 1 question I have:
upgrade to same IOS - done
set priority to 1 to be member - done
write erase - done
delete vlan.dat done
backup run config of stack
stacked the 3rd switch correctly
powered on added switch
current joined stack not powered down
switch came up as stack - sh switch shows as member
now not sure if this is normal but none of the new switch interfaces had any VLAN assigned in their config.
I did a int range and assigned them all -so no big problem. However I was expecting them to be picked up and configured from the master. So is what I have experienced normal??