If your "900 Plus" refers to a printer (like the TUP900 series): Upgrading the firmware – DR900X Plus series
If you are referring to the point-of-sale and retail management software: Download STAR 900 PLUS rar
: Do not turn off the device during the update process, as this can cause permanent damage. Option 2: Star-Plus Retail/POS Software If your "900 Plus" refers to a printer
: This software is enterprise-grade and typically requires a license. You can find official updates and releases through Auto-Star's Support . Download STAR 900 PLUS rar