[UPDATE] I have "solved" my problem by buying new motors and ESCs. I probably destroyed my motors by fastening them to their mounts with too long screws...
[Original description]
I am unable to calibrate both of my ESCs that came as part of the "Power Pack A (Mini) - Twin Engine" sold by Flitetest.
I have tried to calibrate them numerous times, carefully following the instructions manual, but it never works.
Once the ESCs are "calibrated", the motors won't turn very fast. In fact, they will turn at constant speed no matter the position my throttle stick will be.
I dont' understand what is happening as there are no troubleshooting section in the manual and I'm fairly new at this hobby.
How can I correct this problem?