If a firmware update is required, you will be notified as such in the Qardio application. If a firmware update is available when setting up your device, the update will happen automatically while setting up your device. The update will happen over Bluetooth and will take a few minutes.
You can also update your firmware via the Settings menu of the App. Tap the menu icon in the App, tap on Settings and scroll down to QardioBase > Firmware Update. Follow the in-App instructions to complete the update.