Check your monitor's serial number, only when it's within the range below, your monitor is eligible for calibration function:
LCM21H AA22B0174~LCM21H AA22B0323
LCM21H AA22C0327~LCM21H AA22C0413
For calibration, you will need:
1. PC with Windows 7 or above system.
2. LCM215-HDR+ and its calibration cable.
3. X-rite i1/Color Checker Display/Display Plus probe.
4. Download monitor's latest firmware and calibration software here.