I guess the FAQ is down and SEARCH doesn't work??????
What should I do with App Error 523? - BlackBerryFAQ
However, since you have already tried to reinstall the OS, I suggest you wipe it Jl_cmdr and then reinstall the OS.
Check the FAQ for Jl_cmdr info and the yellow sticky at the top of the 880 section for the latest 8830 OS and instructions on how to do it. Follow the instructions exactly and be patient, as it can take an hour or more. And if it fails try it again, using apploader. Make sure that it is an OS for the 8830.