I have this firmware on my D7000 , what does A/B means? What happened if I update it, can I find information about it? Do I find it on Nikons website? :
How to Update Firmware on Nikon DSLR
Model overview: Nikon D90 specs | MPB
Nikon D90 - Wikipedia
Nikon D90 is now officially discontinued - Nikon Rumors
Nikon | Download center | D90
Información batería, Carga de eye-fi, Versión del firmware | Nikon D90 Manual del usuario | Página 228 / 300 | Original
The Nikon D90's Latest Firmware Update: September 2019 – Mecam.me
Nikon D90 - Wikipedia
The Nikon D90's Latest Firmware Update: September 2019 – Mecam.me
Nikon D Series Software and Firmware Updates | Expert photography blogs, tip, techniques, camera reviews - Adorama Learning Center