Originally from /u/RowRocka on Reddit. Gently edited for clarity.
Links to download all iOS 10 OTA ZIPs.
Download an iOS 9.9.10.0 (14A5309d) firmware image with no prerequisites to download iOS 10 beta 3.
- Unzip the OTA
.zip
. - Download Jonatan Levin's OTApack and unzip it into the same directory that you unzipped the OTA image to.