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Even if your device could technically run 4.1, the official servers for these updates have largely been taken offline. An official OTA update file (often ending in .zip or .tar.md5 ) for a device from 2011 or 2012 is no longer hosted by the manufacturer.
You cannot simply download a file and expect it to work. Your phone must meet minimum specs. Most devices that ran 2.3.6 have:
You need this phone for banking, emergency calls, or social media. Buy a used Android 8.0 phone for $50 instead.
Samsung Galaxy Nexus (shipped with 4.0, not 2.3.6). No mainstream phone that launched with 2.3.6 received official 4.1.