How to reset the camera to factory settings?

"Per Sony website:

To restore the camera to its original factory settings, you can perform a settings reset.

The process to reset a camera back to the original factory settings differs depending on the type and model of camera. There are three possible methods depending on the camera:

Reset button on the camera

Initialize or Reset option(s) in the camera menus

Manual reset process

IMPORTANT: To determine the reset or initialize method for your camera, refer to the operating instructions supplied with the product. Online manuals can easily be searched for the words Reset or Initialize to determine the method for your camera. Manuals, Specifications and Warranty information for your Sony product is available online.

NOTES:

Be sure not to turn off the camera while resetting is in progress.

If you are using a model that supports the PlayMemories™ Camera Apps, when you perform Initialize or Setting Reset, apps downloaded for the product may be uninstalled. To use these apps again, reinstall them.

Even if you use this function, all movies and photos are retained.

If an error code beginning with C: or E: is displayed on the camera’s LCD screen, resetting may not resolve the issue.

Reset button on the camera:

Locate the RESET button on the camera.

Use a pointed object (like a ballpoint pen) to press and hold the RESET button for 2-3 seconds.

After 2-3 seconds, release the RESET button.

Initialize or Reset option(s) in the camera menus:

The menu layout is different between cameras so check the operating instructions.

In general, there will be a Initialize or Reset section within the menus of the camera.

Some cameras allow the resetting or initializing of different options such as wireless settings, the settings used in taking the last picture, or all settings. Be sure to look at all available options in the product manual.

Manual reset process:

Cameras manufactured prior to the year 2000 do not have Reset buttons or options in the menus. Follow the steps below to reset:

Turn off the camera.

Remove the battery pack.

Remove the button-sized lithium battery.

Allow the camera to remain without power for 30 seconds.

Reinsert the button-sized lithium battery.

Reinsert the battery pack.

Turn on the camera.

NOTES:

For units that have built in battery and have no reset button, holding down the Power button for up to 30 seconds may initialize or reset the camera.

Are you still needing to replace the battery?"

First, check that there is a reset button located on the camera then take a pointed object (such as a pencil or paperclip) and press down on the button. Hold the object down for 3 seconds and then release.