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Yealink IP Phones Configuring Guide
72
Firmware and Upgrading Issues
Why doesn’t the IP phone upgrade firmware successfully?
Do one of the following:
Ensure that the target firmware is not the same as the current firmware.
Ensure that the target firmware is applicable to the IP phone model.
Ensure that the current or the target firmware is not protected.
Ensure that the power is on and the network is available in the process of upgrading.
Ensure that the web browser is not closed or refreshed when upgrading firmware via web
user interface.
How can I verify the firmware generation and version of the
phone?
Press the
OK
/
√
key when the IP phone is idle to check the firmware version. For example:
28.82.0.20.
Item
Description
1
28
Firmware ID.
The firmware ID for each IP phone model is:
97: T57W
96: T54W
95: T53W/T53
78: CP920
70: SIP-T54S/T52S
66: SIP-T48S/T46S/T42S/T41S
54: SIP-T40P
76: SIP-T40G
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