[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 » T48S after Firmware update to 66.9.0.80 no Downgrade possible?

Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
T48S after Firmware update to 66.9.0.80 no Downgrade possible?
Author Message
East_Yealink Offline
Administrator
*******

Posts: 18
Joined: Mar 2018
Reputation: 3
Post: #2
RE: T48S after Firmware update to 66.9.0.80 no Downgrade possible?
(06-24-2019 01:33 PM)thomas.hauff Wrote:  Hi all,

we want to update one of our T48S (SfB) devices to 66.9.0.80.
According to the firmware changelog (page 3)Changelog,

a downgrade is not possible anymore.
What exactly does the whole text mean in the changelog? Shall we prefer the previous version 66.9.0.78? Are there other limitations with version 66.9.0.80?
Thanks and regards
Thomas

Hi Thomas,

Yealink wants to strengthen the regulation of SFB phones, so we released firmware 66.9.0.80 to disable the ability of downgrading to Open SIP version. There is no other limitation.

If customers need to downgrade the firmware from SFB to Open SIP, please create a Ticket for us, we will follow up.
https://ticket.yealink.com/

Best Regards,
East
07-15-2019 03:06 PM
Find all posts by this user    like0    dislike0 Quote this message in a reply
Post Reply 


Messages In This Thread
RE: T48S after Firmware update to 66.9.0.80 no Downgrade possible? - East_Yealink - 07-15-2019 03:06 PM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  T48S Handset logo and menu style jseeley 0 201 09-05-2023 08:52 AM
Last Post: jseeley
  T41S FIRMWARE 66.9.0.80 vers 66.86.0.5 DANJEAN 1 404 08-23-2023 01:00 AM
Last Post: complex1
  T46U + EXP43 Stuck on Welcome Screen after update danantonielli 0 566 08-03-2023 10:34 AM
Last Post: danantonielli
  Yealink SIP-T40P Firmware UnitedTech_Support 1 1,090 05-05-2023 08:07 PM
Last Post: complex1
  T48S BLF Talking vs Ringing JordanHVRA 0 604 04-05-2023 01:31 PM
Last Post: JordanHVRA
  T48U Custom Firmware Upgrade to Official Friendly 0 1,004 03-29-2023 01:20 AM
Last Post: Friendly
Information Toggle Power LED or update config via remote? 48design-cg 0 659 01-17-2023 05:32 PM
Last Post: 48design-cg
  Yealink T41S firmware kosif 0 1,223 12-19-2022 08:52 AM
Last Post: kosif
  T42S unable to update firmware brianstoiber 6 5,040 09-30-2022 05:31 PM
Last Post: complex1
  T48S Very Slow Response nolto 1 2,251 08-11-2022 05:51 PM
Last Post: complex1

Forum Jump:


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

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