I’m having a similar issue as I no longer see the pressure (BAR30) sensor. It had been working earlier. I receive a calibration error on the barometer stating it can’t be found. I have the BlueROV ver 3 unit, QGC 4.2.3. I have tried the Parameter save and reset to default values with no success.
The Barometer is plugged in to a I2C port as shown below:
I’ve moved your comment to its own post, because the other post was Navigator-specific
The Pixhawk has an internal MS5611-based barometer that measures the air pressure, which is the one shown on your screen (connected via SPI1). The external MS5611 barometer from a Bar30 should show up as MS5611 (I2C1):
It should also show up as a non-zero BARO2_DEVID and BARO2_GND_PRESS.
In your case that’s not being displayed, so your Bar30 is not being detected. I’d recommend double checking the cable, making sure the connector is fully plugged in and that none of the wires are loose. If that doesn’t help your sensor (or Pixhawk I2C port) is damaged or faulty, so you should contact firstname.lastname@example.org to discuss (include a link to this discussion, and your order number (or a rough order date) if possible).
I did try with the power off unplugging the BAR30 sensor from the I2C port and plugging it in again, also checking the wires and there is no observable defects in it. Still no recognition of the sensor when I power up the ROV. I will contact support as you recommend.