I can't restore my backup after trying to downgrade to iOS 12 from iOS 13

I was having too many issues with iOS beta with my WiFi and Cell service not working right and I have an important phone call that i'm expecting, I didn't want to miss this call so I decided to downgrade my iOS. However, for whatever reason, my phone didn't downgrade successfully and I needed to factory reset my phone. This doesn't seem to be a problem, since I have my backup that I just made. After I factory reset my phone back to iOS 12, I can't put my backups on my phone because it's too old. At this point I just want my data back so I just bit my tongue and installed iOS 13 Beta again to circumvent this issue. But iTunes is still telling me that my phone is too old for my backups, so now I may have no way of recovering any of my old messages or settings, I really don't want to have to reinstall all my apps, download my music and get the accounts right again, is there any way to fix this? I saw that messing with the info.plist file and changing the OS may help, but it says it's on iOS 13 and that's what I have so I don't even know what I'd change it to.