update

gradle versions
find wrapper - upgrading
Update Gradle
Update Gradle

When you update Android Studio, you may receive a prompt to also update Gradle to the latest available version. You can choose to accept the update or manually specify a version based on your project's build requirements.

Canon 550D firmware update
Nikon D90 firmware update

After a laptop sleep and wak-up the time is often wrong -> it seems to be the same time as when the laptop was put to sleep. So no updating is taking place.
I use this
sudo ntpd -gq
to update the time.

Navigate this way for options to update:
Control Panel\System and Security\Windows Update