A quick blog post to announced that I archived a bunch of Yealink-related software on Archive.org, including firmware, manuals, and configuration tools.
This is due to Yealink’s support just removing things after updating their website.

You can find the files at:

Happy hacking :)

Small update: I was curious about the firmware 3CX published on their website, being T4XS-66.86.0.180. This firmware not appearing on any official Yealink documentation, I sent them the following email:

Hey, I see that you are offering a T4XS-66.86.0.180 firmware for the Yealink T42s.
I wonder, what are the changes from the official one?
For instance, does the firmware lock the phone into 3cx or is it just bug fixes?
Thanks,
// jae

Today, I received the following response from 3CX:

Hello Jae,
Thank you for your message, The firmware versions you see on the 3CX website are official Yealink firmware build which are simply Tested, certified, and recommended by 3CX for use with 3CX systems
3CX does not modify or “custom-code” Yealink firmware. 
​For further information or comparisons of the firmwares, please contact Yealink directly. 
​Let me know if you require further assistance from our end. 

This firmware has therefore been added to the archive.