Stuck at BG77 power up

Using RAK4631+RAK5860 (BG77 module)
Flashed with Hologram_Ping_LTE example for the board.

It is stuck at
09:44:49.957 → BG77 LTE ping test!
09:44:59.941 → BG77 power up!

I see through hologram dashboard that it is connected but without data session.

Can someone tell me what to do next ?

BTW, I have added LIPO battery and LED is 1800 msec green and 200msec blink so board shows it is in idle connection.

Can anyone suggest solutions ?