Ran Phase 1 Import, waited too long, need to start over

I ran a Phase 1 import on a migrated disk storage unit, and waited too long to do Phase 2; all the Phase 1 images have expired.  I try to re-run Phase 1, and it says the fragments already exist and are being skipped.  Running bpexpdate to un-expire the images does not work.  How do I start the import process over?

This is NetBackup 7.6.0.4 running on Windows.