yealink t21p need help

[eli1511]

hello
i have 25 phone with firmware: 21.70.18.1
hardware: 17.0.0.36
i try to upgrade to 34.71.0.90 or 34.72.0.20 or 34.71.0.76 but is dont work .
its tell me the opretion is sucess but dont realy upgrade.
do you have any idea how to help me.

tanks you and sorry for the eng.

[Karl_Yealink]

The 21.70.18.1 version is a special version.
You can't upgrade this version to global version.

[eli1511]

(05-05-2016 05:53 AM)Yealink_Karl Wrote:  The 21.70.18.1 version is a special version.
You can't upgrade this version to global version.

So what i can do to put vpn fille in thé phones ?
And did you havé à version that i can update.