One idea is to request all the source on the device. Here’s some slopy from Claude. It seems ok.

==== Sample Letter to Garmin Ltd. ====

To: opensource@garmin.com (Garmin’s standard GPL compliance address) and CC support@vespermarine.com.

Subject: GPL Source Code Request — Vesper Cortex H1/H1P Handset (FCC ID filing 1898-20)

To Whom It May Concern,

I am a user of the Vesper Cortex H1P Wireless Handset (Garmin part number 010-02816-10). The device’s installation manual states that portions of the product use software licensed under open source license agreements, and that source code for applicable software is available upon request from Garmin Ltd. or its subsidiaries.

Pursuant to the terms of the GNU General Public License (GPL) versions 2 and 3, and the GNU Lesser General Public License (LGPL), I hereby formally request the complete corresponding source code for all GPL and LGPL-licensed components included in the Cortex H1 and H1P handset firmware, including but not limited to:

  * The Linux kernel and any device-specific patches or configurations (defconfig, device tree source files)
  * U-boot or any other bootloader under GPL
  * BusyBox or equivalent userspace utilities
  * Any other GPL or LGPL components incorporated in the firmware

Please provide the source code either via physical media or a download link. I understand this request may be fulfilled for a fee not exceeding the cost of distribution.

Device details: - Product: Vesper Cortex H1P Wireless Handset - Part Number: 010-02816-10 - FCC filing reference: 1898-20

Thank you, [Your name]