Bluetooth Module Series
HC06U_EVB_User_Guide 16 / 20
3.5. Boot Switch (JK2)
HC06U EVB includes one boot switch (JK2), as shown in the following figure.
Figure 8: Boot Switch
Slide this switch to GND and then press the reset or power button to put HC06U into programming mode.
Slide the boot switch to 3V3 to put HC06U into normal mode.