I want to know how to fix my phone thats says app error 523 reset i how do i reset my phone

SOURCE: My 8350i shows app error

App Error 523 is a software hiccup usually caused by a 3rd-party application that is not compatible with the BlackBerry device OS.

Follow the below steps to get rid of this error message:
1. Take the battery out and put it back in after 30 seconds or so
2. While the device is rebooting (or while the hourglass is still spinning), plug it into the PC
3. Then open the application loader and remove the 3rd-party application that's causing the issue
4. Worst-case is when you need to wipe the device using JL_Cmder. Follow the instructions here:
http://www.blackberryfaq.com/index.php/How_do_I_wipe_the_BlackBerry_using_Jl_Cmder%3F
You can also find out more about the error from the following links
http://forums.crackberry.com/f5/error-523-reset-1831/
http://supportforums.blackberry.com/t5/General-BlackBerry-Smartphone/app-error-523-message/m-p/6223.
Hope this solution has been helpful?

SOURCE: my 8350i keeps showing app

The error is caused by an installed application failing and damaging the BlackBerry Operating system in the process. The fix is to simply erase and reinstall the operating system to your phone. This sounds difficult but isn't too hard in practice. It's something you can do yourself on your home PC using BlackBerry Desktop Manager. If you don't feel confident in doing this yourself then you can take it to a BlackBerry repair centre and they'll carry the repair out for you, but you might have to wait a couple of weeks for them to do it and if you're out of warranty you'll probably have to pay for it.

do a google search for reinstalling the o/s if you feel you can do it

hope this helps

John