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upgrade firmware problems

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kattoussa

Technical User
Apr 19, 2013
53
TN
hello,
i have a big problem, i tried to upgrade the software of UC520 to the version 8.6.1 but the phones 79xx don't accept the new firmware 9-1-1 so i tried to upgarde the firmware to another intermediate version 8-5-2 but they can't register and in the firmware version it shows 9-1-1 and not 8-5-2. how can i stop the phones from loading the firmware 9-1-1 and return to the old firmware 8-3-2 or accepting 8-5-2. i'm very anxious. thanks
 
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