This page is listing the official LineageOS 15.1 (Android Oreo 8.1) changes and downloads for HTC One A9 (hiae).
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* I can't seem to reproduce some widely reported RIL issues (unable to
disconnect from call, unable to receive incoming calls). I suspect
this to be related to the user's carrier/device variant, but since I
don't forsee being able to fix such a critical feature, I'm stopping