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:
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:
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!