[m4f1050]

I just copy PIM.VOL from my root to SD card then back to the phone when I flash it. As long as you don't switch versions where it's not compatible with your original PIM.VOL you're good to go. If it doesn't work, then you can use PIMBackup and when you have a working version just copy that one over and you can keep using that version.

You need a program like Total Commander to copy it back to the phone and do a quick reboot before the phone updates the PIM.VOL do not run any program that access the contacts.