Dual BIOS switch between? Z77A GD65

Greetings.
Have a MSI Z77A GD65A mobo, which should have 2 different BIOS chips. There is a small switch on the mobo where you can switch between them when the PC is turned off.
It does not seem to do anything though. I just flashed ver 10.8 in BIOS A, where I think I did as described in the expectation that the BIOS B would remain as it was.
Used this setting:
The Flash as such went fine, except that BOTH BIOSes now was 10.8. Whether the little switch is the BIOS A or B BIOS, then when it starts up it is in ver 10.8.
In  the printed manual, there should be a section under "Security" where you can turn on "Multi BIOS Update" on and off. It's just not there since ver 10.5 AFAIR.
Instead, there is an option with the same name at the top of the displayed image, but if you use it asks for a USBkey with a BIOSfil on right away, nothing to turn on or off more!
Someone who can guide me on how I switch between these 2 different BIOS, and how I can just flash ONE  bios at a time?

HEUREKA 
Tried a last time to switch BIOS but no luck. Then I wanted to try out "the Forum Flash Tool" and flash the BIOS you attached. I can now see, that the Forum Flash Tool does a LOT more than Mflash, it takes about 5 times as long to flash with this than Mflash.
After the flash was succesfull, I again tried to switch BIOS. WHAUU It worked!! For the first time!!! It was now booting to BIOS ver 10.0!!!!! Then I flashed this to ver 10.7, power down, switched BIOS, and flashed the other BIOS to ver 10.8.
Forum Flash Tool did the trick. Now I can have 2 different BIOS and 2 different CMOS-setup. My guess is, that Mflash puts the softwareswitch out of function. Why don't MSI tell this on their webside? Why does MSI not make Mflash work properly, or remove it completely! I will NEVER again flash my MSI board without making sure, that I have the latest Forum Flash Tool, and then use this.
A big Thank You to the creator of Forum Flash Tool. I hope MSI is paying you a nice salery for this fine job. 
Thank you very much for all your help, xmad. 

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