: Download firmware only from official support forums or the manufacturer’s site. Unofficial .rar files from third-party sites can contain malware or brick your device. Installation Steps :
If you are referring to the point-of-sale and retail management software: Download STAR 900 PLUS rar
: Format a USB drive to FAT32 and copy the extracted file to the root directory. : Download firmware only from official support forums
If your "900 Plus" refers to a printer (like the TUP900 series): Upgrading the firmware – DR900X Plus series Download STAR 900 PLUS rar
: Use a tool like WinRAR to extract the .bin firmware file from the .rar archive.