It is my understanding that upgrading to the 6.00 version may or may not result in a keyboard disconnect.
In my case I upgraded the supplied Pico from 5.00 version to the 6.00 version, and my keyboard is still functional. Maybe I am lucky or maybe it has something to do with the Pico versus Pico 2 update.
In any case, it is recommended that the keyboard STM firmware be upgraded as described in the thread that I have linked you to.
If anybody else can add to this, I would appreciate it as I am not an expert and only listed what worked for me using:
Windows 11
Asus FA 507NV
USB 3.2
Pico. (Not the Pico 2 variants)
And the drag and drop method with the “update firmware” command