T28 P upgrade from 2.2.16.21

[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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Threaded Mode \| Linear Mode T28 P upgrade from 2.2.16.21
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mhadian Offline

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Post: #1

T28 P upgrade from 2.2.16.21

Hi,

I'm having issue upgrade T28P from 2.2.16.21

I assume the firmware is very old and can't "jump" to the latest version.

Been searching the web for old firmware, but I can't find it

Any of you guys still keep the old firmware?

Thanks

07-11-2014 07:27 AM

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T28 P upgrade from 2.2.16.21 - mhadian - 07-11-2014 07:27 AM

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