[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.
https://www.yealink.com/ydmp-freetrial-2020


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Yealink T28P Firmware Upgrade Fails
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rlsabin Offline
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Post: #3
RE: Yealink T28P Firmware Upgrade Fails
The number 12 being displayed indicates that the existing firmware on the phone has software protection and can not be upgraded with the new firmware you are using. You need to find out who the existing firmware on the phone was produced for and contact them to see if they have a later version you could use to update your phones

Rick
01-14-2014 10:59 AM
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RE: Yealink T28P Firmware Upgrade Fails - rlsabin - 01-14-2014 10:59 AM

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