iPadOS 6.1.3 (build 10B329) is an official Apple over-the-air update for the iPad 2 (GSM). The update package is 72.36 MB. This is a delta (partial) update that requires 6.0.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: ce26a623df31f88402f866d183a221e444973dfc.zip.