Background: The Passport detected the SIM card and networks, but wouldn't register with any of them. Trying to force it to register, I copied the modem’s service records from my work phone. After a while, the test phone started acting even worse. So I decided to restore the previous settings (since I’m experienced, I make backups :-) ) Some of the entries from the backup refused to write. So I decided to just delete _/efs/modemfs1 and _/efs/modemfs2 (I’d done this before and everything seemed fine; after a reboot, they were recreated) That might have happened this time if I hadn't run qcnv with the -e (erase all) and -i (initialize) options.

As a result, my phone kept rebooting at about 34% of the boot process. Don't make the same mistakes I did. I've just realized that qcnv deleted the data from the hidden cal_backup partition, not from cal_work.