Flexrt1.zip -

: It often contains the runtime or operating system images for the radio's internal processor.

: In most cases, you do not manually unzip this file onto the card. The SmartSDR desktop application or the radio’s internal update utility handles the installation. FlexRT1.zip

: Ensure you have a compatible SD card (usually 16GB or 32GB) or a USB drive, depending on your specific radio model's update procedure. : It often contains the runtime or operating

Are you trying to or simply updating to the latest software version ? FlexRT1.zip