I'd like some advice on how to deal with the endless problems I've had over the last few months.

Last October I received an URGENT SupportAssist alert to immediately update my BIOS to A14. I assumed that this is what had been preventing the update to Windows 1903 release, so I dutifully installed the BIOS update. BIG MISTAKE.

As soon as the update was done, I started getting BSOD within a few minutes of booting into Windows. Every single time. Then I ran the pre-boot diagnostics, which quickly told me that the problem was a memory error. I had upgraded my system from 8 GB to 16 GB 2 years ago, and the two Silicon Power 8GB DDR3L-1600 CL11 memory cards had worked flawlessly.

At first I had thought the memory went bad (I did not immediately make the connection with the BIOS update), and Silicon Power was very responsive in sending me new replacement memory cards. However, they failed in exactly the same way.

At this point the only way I could get my system running was to take the memory out of my daughter's unused XPS 8300 machine and insert it into my XPS 8500 machine. Her memory is DDR3-1333, so slower than spec for my XPS 8500, but it's the only thing that I have around that will work. With her memory in place, my system works reliably, though may be slower since CPU-Z reports only a 667 MHz clock speed.

Unfortunately, my daughter will be returning home in a few weeks, so I need to fix my own memory problem before she returns and re-install her memory in her XPS 8300. I will be super pissed if I need to buy all new memory for my machine because of this silly BIOS update, and of course I may be throwing good money after bad if the new memory boards fail also.

Before I do anything more I'd like your advice on how to proceed. Do I attempt to downgrade my BIOS back to A06 or A09 (one of which I was using before)? If so, how do I do this? (I tried and the BIOS install program refuses to downgrade.) Is there some setting that I can implement that will make my system work with this memory without constant BSOD errors? Are there additional diagnostics that I should run to better diagnose the exact problem?