how to update bios after RAM change - dell inspiron 1420 - Linux Mint 13

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http://askubuntu.com – I have a Dell Inspiron 1420 with Linux Mint 13 on it (Ubuntu 12.11 I think). I have two sticks of RAM 1GB each. Today, I have changed one for a 2GB one. On boot, BIOS noticed RAM change and redirect me to BIOS setup - to change settings so system knows RAM has changed. Couldn't find out how to do it so resume normal boot. Running free -m shows me Mem: 992 which means the new RAM stick of 2GB has not be recognized and Mint is running with only 1GB of RAM. On Dell website found instructions on how to update the BIOS but it requires Windows. I have also check the linux.dell.com web si (HowTos)