The ASUS motherboards are set up fairly well for updating a bios. It normally gives you two or maybe three ways to accomplish the task.
The one I use is to boot and get into the bios. Your manual should explain this and you just need to download the .bin file and put it where it can be found, like in C: \ or on a flash drive. Beyond that is it fairly simple.
You should have a copy of your original bios on the CD that came with your board. But you can always download another version.
To make sure we are looking at the exact board, is your description accurate, because I see a P7H55-M/USB3 which seems to have updates going to 1105 dated 6/8/2011. If you have a link for the correct board, include it.
If you want to go over the...