AeroPod, PowerPod and Newton

Hello,
I'm trying to use my Aeropod after several months of not using it, and I can't calibrate it anymore.
I'm stuck at step 7 of the instructions (solid yellow). It never switches to flashing red/green.
I repeated the entire procedure several times. What's wrong?
Thank you.

Please email technicalsupport@velocomp.com for next steps.

After a hard reset and upgrade of the firmware, it seems OK, the led is flashing red/green. Ready for calibration.
You can forget my email.
Thank you.