I found a patch that'll allow you to do these things with your D3100:
Here's how to do it:
Read more about this patching tool here:
Nikon Hacker • View topic - Nikon Patch v1.12
Nikon Hacker • View topic - Nikon Patch v1.13
Nikon Hacker • View topic - Nikon Patch v.1.15.0 BETA
Consider donating to to this project via the Paypal box on the patch page if this is helpful to you. The main programmer just bricked his D5100 trying some new things.
- Change Time Based Video Restrictions to 17:28
- Non-brand Battery
Here's how to do it:
- Grab the latest firmware file from Nikon
- Run the exe or dmg file - this will create a folder in the same directly that the exe file is saved in called F-D3100-V101W. It will contain D31000101.bin
- Upload the firmware file (D31000101.bin) here, and generate the patched firmware.
- Put the patched firmware on your sd card in the base directory (top level)
- Insert the memory card into the camera's memory card slot and turn on the camera.
- Select Firmware version from the camera's setup menu and follow instructions displayed to upgrade the firmware.
- After the upgrade is complete, turn the camera off and remove the memory card.
- Access the Firmware version item in the camera's setup menu to confirm that the firmware has been upgraded.
- After confirming the firmware version, turn the camera off and leave it off for five seconds or more before using it.
Read more about this patching tool here:
Nikon Hacker • View topic - Nikon Patch v1.12
Nikon Hacker • View topic - Nikon Patch v1.13
Nikon Hacker • View topic - Nikon Patch v.1.15.0 BETA
Consider donating to to this project via the Paypal box on the patch page if this is helpful to you. The main programmer just bricked his D5100 trying some new things.