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@Suiseiseki The modem used by the Pinephone was made for Windows. The company cut corners and didn't make real Windows drivers but instead put an extra CPU on the radio chip next to the baseband which is used to run their own fork of Android with the Qualcomm drivers and services. That provides an interface to the main OS via USB for using the radio without actually having proper drivers and services for it.

Pinephone SoC has a closed source early boot chain prior to the open source one.