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Procedures to manually Upgrade UC520 from 7.04 to 8.20

I would like to manually upgrade a UC520 system from 7.04 to 8.20.  I have not been able to find any documentation on the process of upgrading outside of CCA.  Are there any documented procedures to perform this process.  The main reason I do not want to use CCA as part of the voice configuration is not supported in CCA.

Thanks,

Tim

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