Any reasonable explanation about that backup pasword ?

I just recently encountered another amazing feature of the 9.0something IOS version on my 6 - My messenger would no longer refresh on his own which results in me not recieving any messages unless i manually refresh the app . After reinstalling facebook and messenger few times, updating to 9.1 and reading about the problem on the internet i found out that i can do 2 things which may help me - 1st resset the settings (nothing achieved with that) , and 2nd to restore the phone . After making a backup RIGHT BEFORE I START RESTORING IT WITHOUT BEING ASKED FOR ANY PASSWORD , and also thats my very first time i use the restore feature at all so after it was completed i simply lost 4 months of memories because of this ******** software due to the fact that i have NEVER set a password for my back up files . I have tried everything , every single password i have used in the past 12 years didnt work (and no I didnt forget to try something , i made a list of everything i have used for the last decade and nothing worked ), wifi paswords didnt work , NOTHING worked . So im finally here looking for a way to CRACK the backup on my pc in order to restore whats the most precious thing that was stored in my iphone memory - my family photos and so on . I dont give a **** if thats agains the rules of this forum . The hard truth is that the software is complete garbage and just forces me to use another software in order to achieve something that simple as restoring my own photos .