Ok...so apparently by using one of these files you can do a HW upgrade from A1 to B1. Hmmm.
Ok, looking at these files and information. I can't tell which ones to use and if you should use them at all since you have a Rev A1 model.
I going to recommend that you get on the phone with your regional local DLink support office and ask them which one of these files you, if any, can use on you Rev A1. Usually Rev A1 need to be updated with Rev A FW files and can not be upgraded using Rev B files. This maybe a special occasion for you. Please phone contact DLink support first and get there official information and help.
Let us know how it goes please.