I always uninstall drivers using DDU in safe mode. I also make sure to uninstall PhysX and do not keep any settings backup. In DDU, I have the option checked to prevent Windows from automatically searching for drivers.
Rename to community_copy and create new empty community folder.
Make sure that your RAM is on the list of compatible RAM for your motherboard. If is compatible, you can proceed with the BIOS update, but IMPORTANT – I suggest having only two memory modules installed in the correct slots. The motherboard manual should specify which slots to use.
As I mentioned earlier, I also recommend testing RAM at 4800 instead of 5400. Using four sticks of RAM with an AMD system is not always the best choice, as it can lead to stability issues.