iOS 13.3 (build 17C5053a) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-12-05T21:11:35Z. The update package is 64.72 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 10c7076cb6bc8bf400b23aa196306391b8fec9ad.zip.