Acer Aspire 3620 Phoenix BIOS update

This is my first post on bios-mods. I am not sure which forum I should use. Please feel free to move my thread to the appropriate forum.

When I run Everest on my Acer Aspire 3620 laptop, it says, "Problem No CPU L2 cache found. This may cause performance penalty." CPUz does not indicate any L2 Cache either. There should be 2 M of L2 Cache on this laptop.

I replaced the original Celeron M 1.6 GHz CPU with a Pentium M 1.8 GHz, hoping that the missing L2 Cache problem was inside the original CPU. The problem still exists with the replacement CPU.

I then wondered if the problem might be in the motherboard. Now I am wondering if the problem could be the BIOS. I ran the BiosAgent online scan which indicated there was a BIOS update available. I went to the Acer site but found only the original BIOS (Phoenix V1.06) which is for XP 32 bit. I am running Windows 7 32 bit.

I went to the Phoenix site to see if I could find this BIOS update but I was directed by a link back to the BiosAgent site.

Could my L2 Cache problem be the BIOS?
Where do I find this BIOS update (that BiosAgent refers to)?
How do I go about updating this BIOS?
Would unlocking the current BIOS help? I have never unlocked a BIOS; I don't know much about it.

Acer Aspire 3620
Pentium M 1.8 GHz CPU
L1 Cache Data 32 KB
L1 Cache Inst. 32 KB
L2 Cache 2 MB
2 GB DDR2 RAM
Windows 7 Home Premium Edition 32-bit
Service Pack 1