Since "fdl2" usually refers to Failed Device Localization (Layer 2)—a common error in networking, telecom, or diagnostic software (like Qualcomm tools or iOS diagnostics)—I have drafted a review based on that technical context.
FDL2: Takes over from FDL1 to manage the actual writing of firmware partitions (like system, boot, and recovery) to the internal storage. Common Causes of FDL2 Failure fdl2 failed
You are trying to flash a version that doesn't match your device's internal hardware (most common). Bad Connection: Since "fdl2" usually refers to Failed Device Localization
Sometimes the solution is a simple command revision. Post the exact error log, device model, tool