Yealink firmware problem xx.86.0.55 upgrade fail

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Modified on August 20, 2024

There are various models of yealink phones that had a firmware with xx.86.0.55 installed mostly by 3CX and you cant upgrade from here. You need to apply the firmware xx.83.0.199 to upgrade further. Here is a link for the different phones

Model	Link
T19(P) E2	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=959d75ac0b3dd1e1
T21(P) E2	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=b8e2ec34613cfb3c
T23G(P)	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=b7479cb0b9fcd73a
T40G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=9ac9c7a732701b59
T40P	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=ac67ff2c90b5b02d
T27P	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=8b619d03bf7f798e
T27G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=9bc318794ac08f04
T29G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=a6f9ea430ce01315
T41P	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=ab35df91ee5e2ff9
T42G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=9347f5aa1bc613e6
T46G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=8e2ccf2792f149b6
T48G	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=bf7f22960c6a7501
T54S/T52S	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=8bef30e8b4063108
T46S/T48S/T42S/T41S	https://support.yealink.com/support-service/attachment/downLoadFile?fileCode=a9c47b6b058eaa82

Once you apply this you can upgrade further.

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