Several thousands of 8930 owners out there, majority of them are having their machines running well after the update.  You happened to be one of a few dozens owners whom received a new BIOS update which cause your system hung at POST.  I hope that I have the answers for your questions
After a minor Windows update, computer didn't reboot. Stuck at the Dell logo. Tried various suggestions from this forum till I found the SSD (Micron 2200s nvme 512gb) was the problem. Removing the SSD from the system corrects the issue. I reinstalled Windows 10 on a HDD (it was initially on the SSD), but now I have some questions: - Why is the SSD, even if OS was corrupted, stopping the boot sequence from happening?- If I buy a new SSD and install it, will I be forced to reinstall the OS there, or the SSD become an extra drive?- Any suggestions on how to recover data from the bad SSD? Should I get an M.2  PCIe adapter and try accessing the SSD that way? Any help/ideas would be greatly appreciated!
XPS 8930, no boot with SSD installed