So you finally managed to break your Zaurus. You have several options to fix it.
- Factory Reset
If you really messed up and just start over again without retaining anything, then just do a factory reset and the Zaurus will revert to its initial Japanese ROM state.
- Restore From Backup
If you have a backup, you can restore your previous settings contained in your backup files. If you had to factory reset, then a restore can quickly get you to where you were before.
- Command Line Recovery
This is by far the most advanced option. Use this to recover files that might not have been backed up yet before doing a restore and/or factory reset.
Please refer to Trisoft's C3000 manual on how to do the above. It would be a waste of my time to provide step by step instructions since they have it pretty much covered, and they even have emergency backup images for you to use.