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Telekom Glasfaser-Modem 2 (aka Sercomm FG1000B.11) firmware update available #428
Description
Looks like now Telekom is making firmware update files for their Glasfaser-Modem 2 (which is a Sercomm FG1000B.11) available through their website:
https://www.telekom.de/hilfe/geraete/router/zubehoer/glasfaser-modem
At the time of writing (2026-01-15) the update files for FW version 090165.1.0.009 for both HW revisions (2 and 2b) are identical.
The file seems to be encrypted / obfuscated (at least binwalk can't find any linuxy things). Is this a known Sercomm update format and are there tools out there already to get to the contents?
Activity
simonebortolin commentedon Feb 7, 2026
free to open a pull request
janh commentedon Feb 27, 2026
Here is a small script to decrypt the firmware image: https://github.com/janh/gfm2-fw-tools
sapperlott commentedon Feb 28, 2026
Awesome - thanks!
Resolve issues #428, #424, #416: FG1000B firmware, Galachip, Zyxel patch
simonebortolin commentedon Oct 9, 2026
Resolved in PR #505
Resolve issues #428, #424, #416: FG1000B firmware, Galachip, Zyxel patch