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Spotted a more important bug that could be related with the battery waste as we discussed earlier. With the same sim in the same phone at the same location, and set for LTE only, here VoLTE works just fine on 22.1, but not at all on 22.2. So 22.2 CERTAINLY introduced some important bug in handling of carriers and bands (the sim is TDC in Denmark).

Due to the changes @Hook reported here, I tried upgrading to 22.2 (again). Will edit this post in some hours with the result.... ADD:  And it is completely USELESS!!! Went from 97% to 47% in short of 8 hours. (Idle overnight, as much as possible uninstalled/disabled,,,,) Will go back to 22.1, or maybe stock and just forget about LineageOS, that (like the AICP project) seems to have F.. itself up to a useless state... Went back to 22.1, though over four months old still much newer than Android 9 in stock....,

I would guess your best chance is to get a faulty unit on e.g. ebay. Note that the Pro1 and pro1x bottom parts are NOT 100%identical. They had to make some changes for the antenna they said somewhere a very long time ago. It has been awfully quite from fxtec for a very long time, so my guess would be that an official new one is highly unlikely.

I don't have any objective way of testing this, but I noticed that the change log for the last update and this one included references to carrier stuff.  It seems to me that my phone call clarity has improved. The phone stuff actually worked pretty good for me from the get go.  It wasn't perfect but far better than many people were reporting.  But it seems, though anecdotal, that it has improved.  Unfortunately, I don't really use this phone as a phone, as ironic as that it is for one that mostly works. So I haven't tried in a very long time, which makes this anecdotal report even more suspicious. 😉

Lineage-22.2-20250804-NIGHTLY-pro1x with July 1st security patch installed smoothly via OTA. MindTheGapps15, and root was maintained.