Firmware not change after upgrade
Last modified date: 2017/02/22 views: 3139

Customer upgrade manually or through auto provision, after phone boot up again then double check but find the firmware not changed, still the old one.



1.      Check if it is a customized firmware , some customized firmware has limitation on upgrade , so please kindly check first , the rule of firmware definition is below :


First number: phone model, for example, T46G is 28

Second number: big version, for example, V80, V81

Third number: custom mark,

if it is 0 or 1, then it means it is Yealink official firmware , all customer can use this firmware

if it is not 0 , then it means it is a customized firmware , only specific customer can use it

Forth number: support version


For example, is a T46 official firmware and is for Broadsoft customers.


So if the firmware you are using is a customized firmware, please connect your phone provider for help to complete upgrade


2.      If firmware is confirmed to be OK , then please check if the phone is provided by the phone manager or service provide , you can log into phone website page  path :


Settings -> Auto provision -> Server URL


Then check if there is someone provisioned your phone.

If yes , please check is there any firmware upgrade related parameter configured and then delete , you can also delete the whole URL if needed ,but note that delete the whole URL will affect the provision of other settings like account or directory setting. 



More Information

If all confirmed to be OK , but still have problem , please send an email to for help .

Product Type
SIP VP-T49G , SIP-T48S , SIP-T48G , SIP-T46S , SIP-T46G , SIP-T42S , SIP-T42G , SIP-T41S , SIP-T41P , SIP-T40P , SIP-T29G , SIP-T27G , SIP-T27P , T4S , SIP-T23G , SIP-T23P , SIP-T21(P) E2 , SIP-T19(P) E2 , CPN10 PSTN Box , Expansion microphone CPE80 , LCD Expansion Module EXP20 , Yealink DECT Repeater RT20 , Yealink DECT Repeater RT10 , Yealink Bluetooth USB Dongle , LCD Expansion Module EXP40 , Wireless Headset Adapter EHS36 , Call Center Headset YHS32 , Yealink Wi-Fi USB Dongle , Download Documents , VP530 , SIP-T38G , SIP-T32G , SIP-T28P , SIP-T26P , SIP-T22P , SIP-T21P , SIP-T20P , SIP-T19P , IP Phone Expansion Module EXP38 , LCD Expansion Module EXP39
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