1. In Ascend, select the Options icon.
2. Select Payment Processing > Pinpad Setup.
3. In Pinpad setup, select the Calibrate icon.
The Calibrating Device window opens and your Ingenico terminal will scroll through several windows for about a minute. Then, the Ingenico terminal will restart and you'll be all set!
Re-calibrating your Ingenico terminal can fix many problems, including issues where it won't accept a firmware update.
Video: Calibrate an Ingenico Payment Terminal