Hello robboyce,
Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with a locked screen with Chinese characters across the bottom. You mentioned that your iPhone restarts continuously, and you attempted to restore your iPhone but that process was unsuccessful.
In this case, we'd suggest that you try the steps listed here, since they're specific to the behavior you're experiencing when trying to resolve this: If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support
Let us know what happens when you complete those steps. If you receive a specific error message, if you could let us know exactly what it says that will help direct our troubleshooting steps.
We hope this helps.
Cheers!