I bought a crashed pv2+ and have been going through the process of getting it back up and running. One of the ESCs needed to be replaced, so I ordered a new one on eBay. The new one is a version 2.1 and the remaining three on the pv2+ are version 2.0. I soldered it in place and everything seems to function properly, except on initial power up the new esc doesn't blink in the same sequence as the other 3. The 2.0s flash red once real quick then go through the red yellow green sequence and then into acquiring gps. The new 2.1 esc skips over the first intitial red blink and goes straight to the red yellow green sequence. Does this mean there is a calibration issue? If so, how do I calibrate?