You will find a Reddit thread, a butcher forum, or a YouTube video faster than you will decrypt the service manual.
Disclaimer: This guide is for informational purposes. For safety and legal compliance in a commercial food environment, always refer to the official Bizerba documentation provided with your specific serial number unit. Bizerba Is30 Manual
Try the universal solution for 90% of IS30 issues: Turn the scale off, unplug it for 30 seconds, plug it back in, and hold the Hold/Print button during boot-up to perform a soft reset. You will find a Reddit thread, a butcher