The UEFI of the motherboard sees only 2 memory modules out of 3-4 installed. Possible to fix?

Question

Windows

Preface. I have an ASRock P67 Pro3 motherboard (2 * 4gb + 2 * 4gb of RAM) with win8.1, in fact, there were no problems. There were rare capital, but not at all disturbing, freezes no more than once every one or two months. Sometimes (once a year or less) a simple reboot did not help and it was necessary to re-plug the memory modules until all 4 pcs started.

Tie. Yesterday, after reinstalling the win8.1 -> win10 OS, regular BSODs started. In the task manager, it showed inadequate "speed" of how many millions of gigahertz (and supposedly 100% CPU load).

Problem. Decided to update BIOS-UEFI (p2.0 -> p3.4). This completely fixed the BSOD problem in win10 (and fixed the "speed"), but "shot off the leg" - it stopped showing more than two memory modules in UEFI and, as a result,

Let's say - 4 modules are installed, but only the second and fourth are visible in UEFI. Removing the fourth module from the slot, UEFI sees the second and! third... (ps but always describes everything as a dual channel)

At the same time, CPU-Z or Memtest86 see the modules installed in the slots.

Are there any options to make all memory modules work without replacing the motherboard or modules like 8gb + 8gb?

Already tried and did not help
1. Lower the UEFI version to 3.3
2. In every possible way poke 4 different manufacturers of memory modules with preliminary clear cmos.
3. Install only 2 modules with a frequency of 2133, but UEFI categorically does not offer anything other than 3 options Auto, 1066, 1333.

Thank you for your attention =)

Photos and screenshots can somehow help:https://yadi.sk/d/4WuOKxprSlVaRg

Answer 1

the RAM is strange: it is usually placed on the mother according to the scheme 1 2 1 2, and not 11 22 . Have you tried the "optimal/default" option in the bios?

Answer 2

Was there a reset (by jumper) of all settings to the factory settings after the BIOS update!?