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There is a bit issue with bios update for Acer Aspire S7-191-6640. I want to update the same because I have a issue with using a external hard drive. As per the solution that I got I have update the bios. I got the bios version from a download site. I am not sure about the version whether it is latest or not. But I want a bit help here to update the same. I tried doing that through a installation utility. The system rebooted in between and then nothing happen.
You have to download the Acer Bios Update tool which will help you to get the right version of bios in your system. Or else it wont work. You can go in the service and download section of Acer system and there you can download the tool first. Then based on your laptop model go to the driver page and download the latest bios version. That will be enough to resolve the problem. Do not use any third party utility for the same.
You can update the same from bios itself. Many system has a auto update utility. While some has a update option through usb. You have to download the bios file and simply connect it to your pc and reboot in bios. Then choose bios update and provide the location of removable storage. Select the file and done. The bios will be updated. This one is the most simplest way. In your case you might be using the wrong bios version.