Yes and software version
Update the software in iTunes and it will do it for you.
Update to the Latest Firmware.
yes. the current update is 3.1.3 and to update to it you have to restore you iphone, update it then re-jailbreak it. but at this moment in time this is not an jailbreak for firmware 3.1.3.
Upgrading an iPhone will update the firmware (the iOS) and will therefore remove the jailbreak. If you wish to stay jailbroken, it is highly recommended to not update until news of a new jailbreak arrives for the upgrade.
To update the Nikon D90 firmware, follow these steps: Download the latest firmware update from the Nikon website. Insert a formatted memory card into the camera. Copy the firmware update file to the root directory of the memory card. Insert the memory card into the camera and turn it on. Go to the firmware update option in the camera menu. Follow the on-screen instructions to complete the firmware update process. Once the update is complete, turn off the camera and restart it to ensure the firmware is successfully installed.
Not sure. Why not downgrade?
No. Linux cannot overwrite iPhone's firmware, as it is encrypted. Only iTunes can do that.
To perform a firmware update on a Nikon D90 in 2017, follow these steps: Visit the Nikon website and search for the D90 firmware update. Download the latest firmware update file to your computer. Insert a formatted memory card into your camera. Copy the firmware update file to the root directory of the memory card. Insert the memory card into your camera and turn it on. Navigate to the firmware update option in the camera menu. Follow the on-screen instructions to complete the firmware update process. Once the update is complete, turn off the camera and restart it to ensure the update was successful.
To update the Canon 80D firmware to the latest version in 2022, follow these steps: Visit the Canon website and navigate to the support page for the Canon 80D. Download the latest firmware update file for the Canon 80D. Insert a formatted memory card into your camera. Copy the firmware update file to the root directory of the memory card. Turn on the camera and go to the firmware update menu. Select the option to update the firmware from the memory card. Follow the on-screen instructions to complete the firmware update process. Once the update is complete, restart the camera to apply the changes. Remember to fully charge your camera battery before starting the firmware update process.
To update the Nikon D5100 firmware, follow these steps: Visit the Nikon website and download the latest firmware update for the D5100. Insert a formatted memory card into the camera and copy the firmware update file onto it. Turn off the camera and then turn it back on while holding down the "Menu" button. Follow the on-screen instructions to update the firmware. Once the update is complete, turn off the camera and restart it to ensure the firmware has been successfully updated.
Home/Menu > Settings/Tools > Update Phone (Option 8) > Update Firmware (Option 1). Hope that helped.
It does it it self.