https://faxloadsmqrb.web.app/download-ios-13-beta-7-ipsw-510.html
How would one go from 13.1 Beta 2 to 13 GM? You can actually just update directly to the iOS 13 GM IPSW without wiping the phone with the shift/option trick....
download iosbetaipsw
https://blacktop.github.io/ipsw/docs/cli/ipsw/fw/c1/
Dump C1 Baseband Firmware
ipsw
https://osxdaily.com/2019/05/24/ios-12-3-1-update-iphone-ipad-ipsw-download/
iOS 12.3.1 Update for iPhone & iPad Released [IPSW Download Links]
iosupdateiphoneipadreleased
https://osxdaily.com/2013/05/02/ios-6-1-4-released-for-iphone-5/
iOS 6.1.4 Released for iPhone 5 [IPSW Download Links]
iosreleasediphoneipswdownload
https://www.ipsw.io/Mac14,9
Select and download signed or unsigned Mac14,9 IPSW firmware. Signed IPSWs can be restored via iTunes, while unsigned IPSWs require alternative restore methods.
ipswbetafirmwaredownloads