This might just be a coincidence but after updating to the modded 2001 I was greeted by long boot times and a frequent bf error on my board as well. Turns out one of my memory sticks died.
I did a search for the bF error code and found a helpful tip to check the DRAM timing controls, anyone listed as 0 in the first set of timings told me to reseast that stick of ram. Tried the stick just by itself and the system would not post at all. Had a 16GB DDR4 kicking around so I tried those 4 sticks instead and the system posted just fine.
Check to see if the correct ammount of memory is shown in your bios and that all sticks show the correct timings under DRAM Control.
I doubt that the bios killed the memory but I've reverted back to the latest official bios release for the RVE3.1.
Intel Core i7 5930K @ 4.8GHz, Asus Rampave V Extreme U3.1, Kingston HyperX Fury 2666MHz 32GB DDR4 ( 4x8GB ), Nvidia GeForce Titan-X SLI, Creative Labs E3 USB Soundcard, Samsung 950 Pro 512GB M.2 NVME, Corsair AXi 1500i PSU, Corsair 900D, Corsair K95 RGB Keyboard, Logitech Proteus Core Mouse, Acer Predator X34 @ 100Hz, Sennheiser Gamer Zero, Windows 10 Professional