Not sure. Why not downgrade?
I do not dare to give a Try, why don't you give a try?
No, unless you have a custom ROM, but still buggy.
I'm not sure what you mean by "the mod" but I think you may be referring to a "custom firmware". If so, you can safely format your PSP's memory stick without removing the custom firmware. This is because the custom firmware is stored in the internal PSP flash memory, not on your memory stick. If you want to remove the custom firmware, you will need to just install an official firmware onto the psp. The easiest way to do this is to put in a PSP game that comes with a firmware upgrade and choose that option. Then I would recommend having the psp do a Network Update.
No.
Firmware refers to the system software of a hardware device. Custom firmware takes the place of normal firmware, often adding functionality aspects to the system.
Right now there isn't. If you want to get custom firmware for psp version 6.20 you need to downgrade to custom firmware using a Pandora battery.
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.
Die
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.
Update the software in iTunes and it will do it for you.
Custom firmware is needed to do it, and if custom firmware is installed on the PSP in use, a plugin can be installed.
Custom Firmware is illegal<-----EDIT:Thats not what he was asking, please asnwer the question