# Raspbery pi wont boot from Ardusub. fails wiith recover4..elf message **URL:** \ **Category:** ArduSub\ **Created:** [July 20, 2021, 7:22pm UTC](https://discuss.bluerobotics.com/t/raspbery-pi-wont-boot-from-ardusub-fails-wiith-recover4-elf-message/10222 "2021-07-20T19:22:59Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [July 21, 2021, 7:04am UTC](https://discuss.bluerobotics.com/t/raspbery-pi-wont-boot-from-ardusub-fails-wiith-recover4-elf-message/10222/2 "2021-07-21T07:04:56Z")
Hi @Robi_Sen, welcome to the forum 🙂 [ArduSub](https://www.ardusub.com/introduction/required-software/ardusub-autopilot-firmware.html) is the firmware for the Pixhawk autopilot, which is different to and separate from the [Companion Computer Software](https://www.ardusub.com/introduction/required-software/companion-computer-software.html) that goes on the Raspberry Pi. Your picture also displays that you’re using a Raspberry Pi 4, which currently isn’t fully supported by our companion software. At the moment we only fully support Raspberry Pi 3B, not 3B+ or 4, but there’s a relatively major update coming in the next few months that will add full Raspberry Pi 4 support. In the meantime, it is possible to use an RPi4 with the current software, but it requires some additional effort to set up, and there are a few issues with the installer script so some features may not be available. If you choose to continue with your RPi4 you can [flash the SD card](https://www.raspberrypi.org/software/) with a clean Raspberry OS Lite install, and then follow the instructions [here](https://github.com/bluerobotics/companion/pull/284) to install the companion software. Once you’ve got a Raspberry Pi with a working companion image on it I’d suggest you follow our [software setup guide](https://bluerobotics.com/learn/bluerov2-software-setup/) 🙂 --- _[View the full topic](https://discuss.bluerobotics.com/t/raspbery-pi-wont-boot-from-ardusub-fails-wiith-recover4-elf-message/10222)._