# S.Bus Receiver Compatibility and ESC Firmware

Source: https://forum.modalai.com/topic/782/s-bus-receiver-compatibility-and-esc-firmware
Category: Development Drones (https://forum.modalai.com/category/44/development-drones)
Tags: seeker
Posted: 2022-03-03 01:32:26 UTC by Guest
Replies: 3 · Views: 1282

## Guest · 2022-03-03 01:32:26 UTC

Can’t get the connection working to the FrSky Receiver we installed, no inputs seem to be visible in QGroundControl – Is the installed PX4 firmware compatible with the FrSky S.BUS receiver? 

Are we missing any settings?

The motors aren’t working, it seems the ESC Firmware is missing (fast flashing blue light) – where to get it?

## Reply by naor92 · 2023-05-15 18:20:29 UTC

Ever have any luck figuring this out? Stuck on the same issue

## Reply by NUMETRIX · 2024-01-07 07:17:19 UTC

@modalab same

## Reply by Alex Kushleyev (ModalAI staff) · 2024-01-08 15:24:22 UTC (in reply to NUMETRIX)

@NUMETRIX , in order to check and upgrade your ESC firmware, you can install the latest VOXL2 SDK, which comes with `voxl-esc` tools.

scan:
`voxl-esc scan`

upgrade firmware:
`voxl-esc upgrade_firmware`

for reference:
https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/master/scripts/voxl-esc?ref_type=heads

(the voxl-esc tools are installed to `/usr/share/modalai/voxl-esc-tools/`) by the SDK. You can call the python scripts directly from there as well (as opposed to using `voxl-esc` wrapper). But make sure to stop PX4 first.

Alex