Unable to connect or upgrade pixhawk

Hi, I have a Pixhawk board from 3DR, the board working correctly in flight and with telemetry but from usb connection I'm not able to communicate with the board.

I'm using mission planner and I already tried to change usb cable, pc, OS and sd Card.

Whe

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Help to use 2W alternative telemetry 433MHz

Hi,

I have found a 2w telemetry with rs232 interface for about 55$ from aliexpress.

This is the datasheet (board name: SNR 6202) .

I bought a pair of these cards, but I was not able to use with the APM 2.6.
I tried to communicate the two cards to each ot

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