Which V73 firmware is correct ??

I have various T26P to upgrade.
Checking the firmware download page:
http://support.yealink.com/documentFront...umentId=17

I noticed that there are two different version of firmware marked as "New":

6.73.0.50 and 6.73.193.50

I don't understand wich is the right version.

Maybe the "6.73.193.50" is newer ?

Thank you for your support