UC520 upgrade question

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Feb 23rd, 2012
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We have a customer with a Cisco UC520 and 7940 series phones currently at 4.2 software. We are adding SPA504G series phones but the unit wont recognize them, we have tried just a phone upload to 8.2 but the unit still doesn’t recognize the phones. If we do a complete software upgrade from 4.2 to 8.2 on the Cisco UC520 will this cause other problems within the system and current phones?

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