RV50 Power LED is bliking and have no connectivity

Hello Guys,
I have an RV50 powered by a battery, the power led turns red and never change to green, also the other leds never turn on.
I change to a 12V power source but the problem persist.

Do you have an idea what is going on?

When the RV50 power light blinks green and yellow it indicates that the RV50 has a GPS fix. When there is no GPS antenna connected to the RV50 and it has good power, the power LED will be solid green. When you press the reset button flashing red indicates when to release the button to reset the modem to factory default settings. These LED conditions are detailed in section 3 of the Airlink RV50 Hardware User Guide (4117313 Rev. 1).