EHS36 with firmware 4.16.0.0 & T38G

[lorn10]

Hi there!

I have the following question. Is the Yealink EHS36 (Wireless Headset Adapter) with firmware 4.16.0.0 compatible to older EOL Yealink phones like the T38G series?

I want to use a Yealink T38G (fw 38.70.1.33) with a new Yealink EHS36 in conjunction with a Plantronics CS540 wireless headset. Unfortunately it does NOT work. The cables are all 100% right connected.

Out of my view there exist most likely an incompatibility between the new EHS36 (fw 4.16.0.0) and the old T38G. The new EHS36 4.x firmware is most likely optimized for the T4x series IP phone models.

Can someone from Yealink confirm here the supposed incompatibility between a new EHS36 and an old T38G?

If this is true, can I make a downgrade from new EHS36 4.x firmware to an older one?

Kind regards
lorn10