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vivkalra
Beginner
Beginner
For all SCCP firmware upgrades from firmware release versions earlier  than
8.3(3) to version 8.5(3) or greater, you must first upgrade your  firmware to version
8.5(2). Once you have upgraded to version 8.5(2), you can  upgrade your IP Phone to version
8.5(3) or later.
For more information we can also check the Cisco Unified IP Phone Release  Notes for
Firmware Release 8.5(3) at the below URL:
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