My Scorpion xxl v2.07 is rapidly flashing which using the Scorpion xl quick start guide, means it is in Calibration mode and press the CAL button does nothing. is there something I'm missing?

I have emailed robo power but in 8 years of manufacture they haven't posted a user's guide so I got little hope. I got it second had but it was working fine when it got it. The only thing I have done to it is reflow the RX leads as they were very weak.