How can I format the racket manually?

Open the butt cap
Connect the USB cable to the computer
Plug your PLAY racket into the charging cable (Making sure that the racket is detected by your computer)
The light might be solid Red or solid green (if the racket is fully charged)
Helped by a pen/sharp tool, press 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