Update M26 to latest firmware to support MQTT

I want to find the latest firmware for M26 that supports MQTT protocol. The manual says that M26 should have software version M26FXRXXAXX_BPU. Where do I find that version?

Dear domonap
Where did you get the module? Please get the firmware at the place where you get the module.

Dear domonap
Please provide your email, I will send it to you via email .
Best wishes