I've just changed the ssd (harddisk) of my Lenovo ThinkPas T440s, then installing Window 8.1 Pro on the new ssd. To do that, I first changed the bios settings, allowing for legacy boot. Then I powered-off the machine from the bios (Disable Built-in Battery), so as to change the ssd. Eventually, there was some problem with the bios, so I disconnected manually the internal battery. Bios: LENOVO GJET89WW (2.39 ) 04/12/2016 Boot Mode: Legacy BIOS in UEFI [ This is the lastest bios, obtained here: support.lenovo.com/fr/fr/products/Laptops-and-netbooks/ThinkPad-T-Series-laptops/ThinkPad-T440s/20AQ/CTO1WW/downloads/DS035965 ] Now, when I enter the bios, I cannot change any setting. How can I fix that?