Or… you could always save your data to an SD card, buy a runner with a cracked screen on ebay for almost nothing at the moment and swap the processors out. That’s what I’d do cos I’m a cheapskate! 
Not necessarily. It could be the ‘corrupted EFS partition’ issue described in this post (which talks about XZ1C, but XZ1 is the same hardware platform, so it could be the same problem). A possible fix is described in the linked web article, and summarised in the post. Worth giving it a try before messing with the hardware (or paying someone else to do so).
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WOW… That fixed it! Thanks for pointing me to that. Both SIM slots (and IMEIs) working now.
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