[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.
https://www.yealink.com/ydmp-freetrial-2020

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

Thread Closed 
 
Thread Rating:
  • 1 Votes - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
T48U Custom Firmware Upgrade to Official
Author Message
Friendly Offline
Junior Member
**

Posts: 1
Joined: Sep 2017
Reputation: 1
Post: #1
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
Find all posts by this user    like0    dislike0
Thread Closed 


Messages In This Thread
T48U Custom Firmware Upgrade to Official - Friendly - 03-29-2023 01:20 AM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Yealink SIP-T40P Firmware UnitedTech_Support 1 403 05-05-2023 08:07 PM
Last Post: complex1
  T41S custom sip header volga629 0 342 03-20-2023 10:08 AM
Last Post: volga629
  Yealink T41S firmware kosif 0 870 12-19-2022 08:52 AM
Last Post: kosif
  T46S will not upgrade 79schultz 1 1,201 10-12-2022 03:11 AM
Last Post: complex1
  T42S unable to update firmware brianstoiber 6 3,668 09-30-2022 05:31 PM
Last Post: complex1
  T48U 'transfer.dsskey_deal_type' issue srcenturic 0 1,042 06-27-2022 02:52 PM
Last Post: srcenturic
  Text color on T48U here4real 0 1,162 03-10-2022 12:57 AM
Last Post: here4real
  Yealink T48s Firmware update failed dangmoss 2 4,993 02-19-2022 03:09 AM
Last Post: dangmoss
  Problem Change Firmware T48s from SFB to SIP Lars Maschke 2 4,477 01-14-2022 10:22 AM
Last Post: kumagera
  T48U - how to remove the DND button from main screen ckatz@bluip.com 1 3,286 11-10-2021 12:05 AM
Last Post: sbrammer

Forum Jump:


User(s) browsing this thread: 1 Guest(s)

Contact Us   Yealink   Return to Top   Return to Content   Lite (Archive) Mode   RSS Syndication