Hello: I would like to get the Bios unlocked to upgrade the Ram. Acer Aspire AM3400-E2122 AMI BIOS: P01.B4 dated 29.08.2011 Hxxp://global-download.acer.com/GDFiles/BIOS/BIOS/BIOS_Acer_P01.B4_A_A.zip?acerid=634502065038513137&Step1=Desktop&Step2=Aspire&Step3=Aspire M3400&OS=721&LC=en&BC=Acer&SC=PA_4 Adding extra 4GB Ram. Bios reports it correctly as 8192Mb but unable to load Windows 7. Error on start up: hardware change detected, re-install windows or contact manufacturer. Go to re-install Windows, get same message! Even tried to delete the entire partition and re-install. No luck! Please help. Thanks in advance.