---
title: 'I broke another test phone'
url: 'https://bb10.root.sx/blog/i-broke-another-test-phone'
markdown: 'https://bb10.root.sx/blog/i-broke-another-test-phone.md'
date: '2026-04-04'
description: "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 broke another test phone](https://bb10.root.sx/blog/i-broke-another-test-phone)

   4th Apr 2026  

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/modem*fs1* and \_/efs/modem*fs2* (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.

---

## Navigation

- Parent: [Blog](https://bb10.root.sx/blog.md)
- Previous: [Autoroot v2](https://bb10.root.sx/blog/autoroot-v2.md)
- Next: [Autoroot](https://bb10.root.sx/blog/autoroot.md)