W52P latest firmware

Hi,

It is not easy to understand the firmware number classification, not clear.

I have a base with version:
Firmware Version 25.73.0.40
Hardware Version 25.1.0.0.0.0.0

And two handset with version:
1 H1 26.73.0.11
2 H2 26.73.0.14

I am trying to understand which lastest version of the firmware i have to install to have the same release everywhere. Is it possible to help me a bit on that please ?
Actually i cannot find this version nowhere: 26.73.0.14

Thanks for your support.