Firmware And Upgrading Issues; Fail To Upgrade The Phone Firmware; Verifying The Firmware Version - Yealink SIP-T2 Series Administrator's Manual

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones

Firmware and Upgrading Issues

Fail to upgrade the phone firmware

Do one of the following:
Ensure that the target firmware is not the same as the current firmware.
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Ensure that the target firmware is applicable to the IP phone model.
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Ensure that the current or the target firmware is not protected.
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Ensure that the power is on and the network is available in the process of upgrading.
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Ensure that the web browser is not closed or refreshed when upgrading firmware via web user interface.
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Verifying the firmware version

Press the OK/√key when the IP phone is idle to check the firmware version. For example: 28.82.0.20.
Item
1 28
2 82
3 0
4 20
536
Firmware ID.
The firmware ID for each IP phone model is:
70: T54S/T52S
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35: T48G
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28: T46G
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66: T48S/T46S/T42S/T41S
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29: T42G
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36: T41P
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54: T40P
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76: T40G
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46: T29G
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69: T27G
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44: T23P/G
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52: T21(P) E2
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53: T19(P) E2
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78: CP920
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Major version.
Note: The larger it is, the newer the major version is.
A fixed number.
Minor version.
Description