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Yealink Forums » IP Phone Series » T4x Series » T42S unable to update firmware

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T42S unable to update firmware
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complex1 Offline
3CX Adv. Cert. Engineer
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Posts: 1,544
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Post: #2
RE: T42S unable to update firmware
(08-24-2022 03:15 AM)brianstoiber Wrote:  I have multiple T42S SIP phones. They were on an old firmware version (66.83.0.30) and needed to upgrade them as I am moving our service to 3CX. I need to get to 66.86.0.5.

I have been able to upgrade the firmware to 66.84.0.35 but I can't get them any farther than that. Every time I try to upgrade them, I get an error saying

Update failed(-5)

or they will say

Firmware updating...
Do not power off!
Unable to complete.
Will try again now!

Any help on what I need to do?

Hi,

Please reset the phone to factory default and try again.
Kind regards,
Frank.

I am not an employee of Yealink.
Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.
08-24-2022 05:41 PM
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Messages In This Thread
RE: T42S unable to update firmware - complex1 - 08-24-2022 05:41 PM
RE: T42S unable to update firmware - oliv - 09-29-2022, 07:45 PM
RE: T42S unable to update firmware - oliv - 09-30-2022, 02:29 PM

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