SIM868 firmware flashed but GNSS not working


#1

Hi All
I am trying to flash a SIM868 module in order to restore the GNSS part, as it was totally missing when I got the chip.
I am using the MTK Flash Tool v5.1612 as in the image1 , and flashing by the UART connection.
The SIM868 is on a breakout card as in the image3.
This card include the connections between the GNSS serial port and the SIM UART2.

The firmware flash configuration (.cfg file) is:
ARM_BL (SIM868M32_BOOTLOADER_V005_MT6261_1418B03SIM868M32.bin)
ARM_EXT_BL (EXT_BOOTLOADER)
PRIMARY_MAUI (ROM)
VIVA (VIVA)
GPS (B03V02SIM868_11.bin)

The flash operation seems to be OK up until the GPS part.
At that point the flash tool seems to hang for 2 minutes and then reports that download has failed.
The module actually seems to be working, except the GNSS functions.
I can activate the GNSS module, but when I issue AT+CGNSINF I only get:
+CGNSINF: 0,,,,,,,,,,,,,,,,,,,,
The module has an external antenna, so the GPS signal is there.

My question is: what is the correct way to flash the firmware including the GNSS part?
Do I need a special hardware to achieve this?

Thank you in advance for help!


#2

Looking at command response. Firmware is ok. You might be Indoors. Take device out for satellite sync to get values.


#3

Hi Ravi
Thank you for reply.
I will try again to get outdoor signal and get back to you.