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@MonCon, Peaseley thanks you for your well wishes. Considering all he's been through, I think he is doing quite well. Here he is post sew-up. As you can see, he has managed to keep his cheerful disposition through it all. He is currently resting, and helping himself to quite a few Easter treats. He's a bit self conscious about it, so no photos of the feasting (yet).

The screens for the Elephone U Pro are made by the same company that made the screen for Pro1 and Pro1x. However (and I don't know the technical details) they need a patch or there will be a wide margin around the screen where there will be no touch sensitivity, a dead area for a wide margin clear around the screen. The company used a patch for the Elephone U Pro models, but it requires Android 10 or earlier to use. They never even officially released the patch, but FxTec was able to obtain and incorporate the patch into the Pro1's version of Android 9. But the Pro1x runs on Android 1

Here is a photo showing the longer, positive tab on the left.

My prototype is starting to look promising. Here is a video how the sliding works. I have added magnets for the closed position since filming. I like how it works now even so it not anything like Pro1. https://youtube.com/shorts/1MKx5WJQYBY?si=EVlCHOW1qPO22pJX I flipped the left side sliding mechanism so it is more durable. For the right side I had to use narrower mechanism so I could not fit circle magnets to the upper part. I used magnetic stripe/tape instead. It is not as strong but good enough. Now I am thinking if I can identify keyboard position (closed or not) with NFC. Y

I don't know if stock Pro1 is updating display's firmware but I doubt it. What you write is basically correct, but display has some configuration options and default margin configuration is different for Pro1(x) and Elephone U Pro phones. Maybe they are handling screen edges differently at kernel level. So display is connected through I²C interface and display controller has a description where possible configuration options are written and display margin is among them. So it is clear what should be done. However, I don't know how Android could be told to stop using touch inter

Yes, I agree. The fact that their communication was inadequate and erratic even in the best phases runs through the company's history. All we know is that sometimes someone will still answer questions directed to their support (which must clearly be read as noncommital even if they seem to promise something to happen "in one or two weeks" or something like that).

I forgot to add this, for anyone else who gets these exact same batteries: The positive tab is the one on the left, as you are looking at the side of the battery with the printing on it, and the tabs facing up. It has also been extended at the factory, so the positive tab is longer than the negative tab. I'll add a photo later.

In related news, I measured the voltage of each of the 10 batteries. They were almost all identical. They ranged from 3.83 volts to 3.85 volts. I'll guess that at roughly 70+% of capacity, going off some online curves for LiPo batteries and some readings from the AccuBattery app for the (estimated 91% of new capacity) battery in my Pro1 X. I plan to set a calendar reminder to charge them back up to about that level every half a year or so. I'll document that process when I get some equipment I've ordered.

Here is the video for screen replacement, It is for the Pro1, but that won't make a difference in this case. https://community.fxtec.com/topic/3222-new-at-least-to-me-pro1-pro1x-repair-videos/ However it shows you changing the whole display, including the frame, You do NOT want to buy the Elephone U Pro frame for the display (it's usually a choice or they don't include the frame at all), the Pro1x's frame is different. So the added removing the old screen (some glue to work loose) and lightly gluing the new display into the frame.

We need to be clear here. IIRC, you have a Pro1x, not a Pro 1. The Elephone U Pro screen will still work, but neither Stock Android 11 nor Lineage OS will fix the margin problem. The only method that has been reported to work is first installing the display in a Pro1, doing the fix and then transferring to the Pro1x. Be aware, I have not done this. Since I don't believe you have a pro1, this is probably not a workable solution, sorry to say.

Search a display made for Elephone U Pro for example at Aliexpress. Usually displays sold at Aliexpress are not perfect, most probably there is at least one black part of a corner which is not a big problem but be prepared (so there are more or less missing pixels at one or two corners). Also, a configration may be necessary of the margins of new screen which is atomatically performed by last stock firmware but not the LineageOS version. Prior to that, the very edges of the screen will not react of touching, that is a configuration mismatch.