Welcome to Larvitz Blog! I’m Christian, a Cloud Consultant by day and FreeBSD enthusiast by night, with over 20 years in enterprise IT. Here I write about FreeBSD jails, PF firewalling, self-hosting, Linux system administration, and anything that’s cleanly engineered. Most articles are hands-on guides born from running my own infrastructure, from dual-stack networking and Ansible automation to hosting a Mastodon instance on FreeBSD.

Have a question or want to discuss something? Find me on the Fediverse at @Larvitz@burningboard.net. I’m always happy to chat!

#wwan Articles

Sat 11 April 2026
Linux

Replacing Lenovo’s WWAN Unlock Blob with a 100-Line Bash Script

My ThinkPad T14s shipped with an Intel XMM7560 LTE modem that would not register on the network until Lenovo’s proprietary FCC-unlock helper ran. I replaced it with a roughly 100-line bash script from a ModemManager merge request, and along the way learned that the “unlock” is just a small challenge-response handshake that is easy to explain in plain shell.