How can I format the racket manually?

Plug your PLAY racket into your computer using the charging cable
The light might be solid Red or solid Green (if the racket is fully charged)
Helped by a pen/sharp tool, press (quickly) 10 times in a row the ON/OFF button as shown on the following picture:
After pressing 10 times the ON/OFF button, the light of the racket should do this:
1. A red light will flash for a decade of seconds
2. Then the light switches off
3. It switches ON again, and a red light will flash red/purple few seconds
4. And the light become solid red or green
The racket is formated