hey guys so i was trying for a long time trying to get my iphone to downgrade and kept running into the issue of it saying that the firmware was not compatible and i dont know if it was just the download that i was using for the ipsw or not but i went to a different site to download the ipsw and it worked just fine. I decided to try and find new websites because all of the ones that are recommended in youtube tutorials never seem to work for me. Anyways here is the website that i used to download the ipsw, id recommend running a virus scan before downloading anything.

Website i got my ipsw off of.
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I have an iphone 5S model a1453 and its a global version. if youre having trouble finding the ipsw for ios 8.4 and you have the same exact phone and model use this link. [ Register or Signin to view external links. ]

By the way i am doing this on a mac, i would not think that it would be any different on a PC.
Let me know if this works for you guys