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yealink t21p need help

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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.

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