Few weeks ago I’ve decided to shoot more tutorial videos about INAV and this is the first effect of that decission: INAV Troubleshooting: why INAV is not arming

Long story short, here is a short list:

• Pre-arming errors: Check the setup page for any red flags indicating issues.
• Throttle too high: Ensure the throttle is at the lowest position.
• GPS lock required: Some configurations require a GPS fix before arming.
• Accelerometer not calibrated: The flight controller needs proper calibration.
• Compass calibration issues: If the compass isn’t calibrated, arming may be disabled.
• Failsafe settings: Incorrect failsafe settings can prevent arming.
• CLI mode active: If the controller is in CLI mode, it won’t arm.
• Receiver issues: Ensure the receiver is properly connected and configured.
• Battery voltage too low: If the battery voltage is insufficient, arming may be blocked.

If you want to know details, here is a video with all relevant information