I was recently given a U3219Q to use at work. It was working fine, USB-C to MacBook Air M1. I got a Mac Mini M1 that I wanted to use on the same monitor, so (still working with the USB-C MacBook connection). I downloaded DDM, and when it prompted, I tried to update firmware. I got an update error; maybe 5-10% of the bar was loaded. I followed the instructions exactly (closed updater, unplugged, etc.), but when I turned it back on, it wouldn't connect. I tried literally everything I have seen out there. The USB-C connection no longer works. I've tried multiple cables, including the same cable that worked this morning, which is also the one that came with the monitor - also checked the cable elsewhere. So, I connected the Mac mini with HDMI and USB. The connection worked, and I once again downloaded DDM. It did not sense the update, so I downloaded the driver directly from Dell (quit DDM), tried to update, and it failed (update error) at about the same point. I once again followed all the given instructions to the letter. Restarted the computer and everything. Tried 5+ more times, and it kept failing at the exact same point. It is worth mentioning that the USB-C connection still won't work (to either the Mac or the Dell PC I tried). Asked around and found a Dell PC I could borrow. Connected it with HDMI and USB. It detected the need for the update and had a freeze failure at 3/4% and failed. Tried again 3 more times, and it failed at the exact same place. Tried with a Dell PC, "froze" at 3%, tried 4 times. USB-C still doesn't work. I am beyond frustrated and have scoured every corner of the internet for a solution. I made sure that there were no other cables (besides the USB-C originally and the HDMI+USB for the other attempts). I had unplugged it (all cables, pressed the power button to drain the residual power), restarted all of the computers involved countless times, and tried uninstalling/deleting both the driver package and DDM. Nothing works. At the moment, the HDMI+USB connection works, but the USB-C doesn't work (though at one point, it recognized me plugging/unplugging it as an accessory to the HDMI computer). It doesn't even work with the HDMI for the USB connection - I have to use a standard USB. I am at a loss and would really appreciate a solution. I found 2 posts here with nearly identical issues with no solution from other users or Dell. It is really frustrating to see that this is an established issue and that there is no solution, though I would love to be corrected on that. The warranty expired a few months ago, but I cannot find anything that I did (besides following the instructions for updating the firmware). It is currently on M3B107, and I have been attempting to update to M3B111.