Choose an OTA for the iPhone 3GS

1 Choose a product
2 Choose a device
3 Choose a version
4 Download

OTA firmwares cannot be restored to. IPSW Downloads collects them for potential future use. They might also be useful if you're doing research.

Signed OTAs

✓iOS 6.1.6 (10B500)October 4, 2015757 MiB903b149c839c0650fd072d47c52599a52cbdd292.zip
This page omits OTA downloads with version prerequisites. You can view these on this API endpoint.
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