Z77A-GD65 ram and DR. mos problem after 2 years without any HW change or OC!

Hi guys, i have three Z77A-GD65 from 2 years with the same hardware config, no overclock or others OC settings ....simply default bios settings;  in this last 2 months, not at the same time, all of my 3 mainboards  have the same identical problem.
One day, from nowhere, without any reason, i start my pc and mobo don't start, hangs with code 55 ( memory error) and Dr mos alarm led goes on, i try to reset bios .. nothing.
I Switch multibios to "B" bios and works perfectly .. i've tested all of RAM modules and result works perfectly !! .... all of three mainboards have the same identical problem!!
Now i use all my 3 PCs with "B" bios and works perfectly, because "A" bios hangs always with code 55 and with Dr. mos alarm led on, i try to update and downgrade "A" bios ... nothing to do ... "A" bios don't work anymore.
Any idea?

Quote from: Nichrome on 19-July-14, 02:32:51
Don't have to be rude 
If same problem is on 3 motherboards then is something wrong with RAM or BIOS not the motherboard
>>Posting Guide<< Reminding again if you want to receive any help.
Nichrome, you misunderstood! ... I just responded to your affirmation .. that's all, it was not my intention to was "rude" as you wrote! OK? 
Ram  modules have been tested on other Asus mainboard  .. .. no read/write errors and no hangs problems ... so all Ram modules are fine
About bios ..... maybe primary bios is physically damaged.... i try to reflash bios also with old version .. no way .. maybe primary bios damage in all 3 mainboards  !! very strange!!! ... you know if there's a know manufacturing defect on this MB bios maybe on a particular MB serial part number? because i bought all 3 mainboards at same time about 2 years ago.
Quote from: Sea Dog on 19-July-14, 02:40:52
Obviously, there is 'something' that has caused BIOS corruption in all 3 mainboards A chips. Whatever that 'something' is, it may happen to the backup B chips as well. Recommend to concentrate on finding this 'something', what the common denominator is, and restoring BIOS chips A before the mainboards may become expensive paperweights. A shop with an SPI flash programmer device can fix the broken BIOS chips if not comfortable with doing the recovery procedure yourself.
Hi, yes i agree,  In fact, my fear is to have, in a while, these mainboard totally unusable!  ..... i think that primary bios is physically damaged or i hope, software damaged, I would try to recover it,  if it's only a software problem (i hope so) ... do you know a procedure to completely erase cleanly that reflash the primary bios? i try to use dos MSI flash utility with "/p /b /n" options .. no success to restore A bios ... same story ... error 55 and DR-mos alarm led on.

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