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Yealink Forums » IP Phone Series » T4x Series » T48U Custom Firmware Upgrade to Official

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T48U Custom Firmware Upgrade to Official
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Friendly Offline
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T48U Custom Firmware Upgrade to Official
I have a few brand new T48U Phones that have v25 custom firmware.
Simple upgrade to v0(official) fails...
Usually recovery mode would help, but on this model you only get the choice of booting to the preset older firmware(same v25 one)

I'm very comfortable with all Yealink Phones and TFTP setups and done many easily, but can't seem to find a way to enter regular recovery mode for this model.

Please help Smile
(03-29-2023 01:20 AM)Friendly Wrote:  I have a few brand new T48U Phones that have v25 custom firmware.
Simple upgrade to v0(official) fails...
Usually recovery mode would help, but on this model you only get the choice of booting to the preset older firmware(same v25 one)

I'm very comfortable with all Yealink Phones and TFTP setups and done many easily, but can't seem to find a way to enter regular recovery mode for this model.

Please help Smile

In case somebody else hits the wall with this issue, I just figured this out.
Simply do recovery mode with choice 1 to revert to previous firmware a few times in the row and it took me back to the official firmware.

Enjoy
(This post was last modified: 03-29-2023 01:37 AM by Friendly.)
03-29-2023 01:20 AM
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T48U Custom Firmware Upgrade to Official - Friendly - 03-29-2023 01:20 AM

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