It could be hardware (shutter?) according to this thread: https://www.dpreview.com/forums/post/55878124Well the one I mentioned I have been using for about 7 years I also bought refurbished from Olympus. If this was a common issue with firmware then I would expect all bodies to experience this. Since I have only heard of these issue right now from you, logic would indicate it is with your specific copy and therefore likely hardware related.
I am lucky to not have experienced this. But I use Samsung or Sandisk 256 Gb micro SD cards in adapters for my cameras. I would guess it to be your memory card as you are having the same problem in many cameras.It could be hardware (shutter?) according to this thread: https://www.dpreview.com/forums/post/55878124
It's worse when I do any sort of bracketing where the final shot may lock it up. Single shot isn't a problem, but sometimes a sequence burst will jam it requiring me to remove and reinsert the battery. Think I'll live with it as this one looks really clean overall compared to other used ones I've gotten. Don't know if Olympus Service will fix it due to it being a converted IR camera by someone else. Probably claim it needs a new sensor as well as shutter - if that's the lock-up issue.
Fwiw, this third E-M1.1 was a used one from Lifepixel who gets them from maybe KEH or MEH to convert them to IR for sale on their website. Their used conversion sale took about a month so I'm guessing they buy a used one elsewhere and then convert it. Unfortunately, the first two from them suffered the bad E-M1.1 shutter dial issue and went back the same day I got them. They were puzzled as they say they check them prior to shipping, but dpreview is full of the E-M1 rear dial issues. Learning experience for them and me.
While I haven't tried the firmware myself, but your question raises two issues. First it needs to be an AF lens so yes the ZD lenses would fall under that category, but do they have to be CDAF compatible lenses rather than PDAF in order to do the micro AF adjustments for each shot? That could be were there might be a stumbling block and may limit you to CDAF capable ZD lenses such as the 14-54 Mk2 and the 70-300 and maybe one or two others which I think were all kit lenses mostly at the time before they moved on to m43.The original hacker, Abel, stated that it was available for any arbitrary lens so does this include ZD lenses used with adapter?