Ec 20 not working

Technical Subjects Hardware Baseband
1

I experienced ec20 not working voltage on Power key 1.3v, reset 0V, Vbat 0.4 v

Please help me

2

Hello, the VBAT voltage of the module should be between 3.3V-4.3V. Your VBAT voltage is too low, so the module cannot be started.