RAM issues after BIOS update

[Uuyucool2012]

Hi,

I have a Lenovo Ideapad y410p, and yesterday I updated my BIOS to version 3.08 which was for Haswell based Windows 8.1 x64 OS.
After flashing the BIOS, I noticed that my games were taking too long to load, minecraft was freezing. I had set the minecraft client to use 3.25 gb of RAM since I have 8 gb.
When I opened up task manager, it registers only 4 gb of RAM and only 1 out of 4 RAM (instead of 2) slots are being used.

Somehow flashing the new BIOS made it disable the second RAM, I'm not sure. I was wondering how I could revert my BIOS back to original version.

DxDiag
TaskManager

Thank you.


UPDATE:

So I opened up my laptop. There are 2 RAM slots with 4 gb RAM in each.
Interchanging the RAM sticks has no effect, while on removing either of the RAM sticks the system does not boot.

UPDATE 2:

I looked up CPU-Z on the SPD tab and here is what I found:

• 
  Slot 1 in Memory Slot Selection shows DDR3 ram with 4gb memory.
  Slot 2 shows DDR3 ram with only 512 MB memory(instead of 4096 MB).

CPU-Z Log

 

[SBMfromLA]

Did you check your RAM settings from within your BIOS?

 

[Uuyucool2012]

Did you check your RAM settings from within your BIOS?

The thing is that, the BIOS is locked. All the advanced settings are hidden from the user.
To make them show, one will have to flash a modded BIOS.