OEM X58 RAM problem / unlock request

Since I've gone from 6 to 8GB RAM, I've been having problems with my motherboard. Every time I do a cold boot, Windows (10) hangs after a couple of minutes. When I restart, Windows is only using 6GB RAM (but CPU-Z still reports 8GB). After another restart, everything is back to normal, and it will stay like that till the next cold boot.

I believe this is my problem, but no one talks about Windows hanging. Still it seems the X58 is the only motherboard with this problem, so I'm going to guess it's also the cause of my problem. I don't think it's because of faulty RAM / slots because it only happens right after a cold boot.

To solve it, I need to change some values, but my OEM BIOS (Medion) doesn't let me. I only got the basic settings, and certainly no overclocking settings. Additionally, I also can't control my fans, so I hope to fix that as well. I could flash the generic X58 Platinum AMI BIOS,

So my questions:
- Is it possible to unlock this ROM or maybe add the functionality?
- Would flashing the generic (and more up to date) X58 Platinum BIOS be better? I don't want to brick my BIOS, but I've found some successful reports on forums with similar configurations. I can't seem to find my BIOS chip, so I'm afraid it's soldered, which makes it a lot more difficult to replace it.
- Maybe someone has experience with this particular problem?

I've added my current ROM and the results from 'BACKUP_Tools', but the latter gives an error. I've also added the latest official MSI ROM.

System Info:
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MSI X58 Platinum (MS-7522)
i7 930
8GB RAM
Windows 10

  BIOS Files.zip (Size: 1.84 MB / Downloads: 0)