HCL Laptops seem to be a brand sold exclusively in India.
Likely all the BIOS upgrades are available at the Driver Downloads link at http://www.hclstore.in/
I wasn't able to check as the link site was down when I tried.
as per ur suggestion i visited hclstore.in and went to my laptop category
Currently the BIOS used is Phoenix TrustedCore.
BIOS Version Q3B52
and I have seen a BIOS update of Taurus BIOS R4595 Ver Q3C61 in the download page.
Is this the update of my existing BIOS ?
Please suggest me because I need my 4GB to be used as well.