# FMU v2.4.8 vs V4.3.6 & V4.3.7, Firmware location and more

**URL:** <https://discuss.px4.io/t/fmu-v2-4-8-vs-v4-3-6-v4-3-7-firmware-location-and-more/24437>\
**Category:** Pixhawk\
**Created:** [October 4, 2021, 6:38pm UTC](https://discuss.px4.io/t/fmu-v2-4-8-vs-v4-3-6-v4-3-7-firmware-location-and-more/24437 "2021-10-04T18:38:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Justhanging](https://discuss.px4.io/user_avatar/discuss.px4.io/justhanging/32/8197_2.png) [@Justhanging](https://discuss.px4.io/u/Justhanging)\
**Post date:** [October 4, 2021, 6:38pm UTC](https://discuss.px4.io/t/fmu-v2-4-8-vs-v4-3-6-v4-3-7-firmware-location-and-more/24437/1 "2021-10-04T18:38:14Z")

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I wanted to update my Pixhawk V2.4.8 to a newer version. The new Pixhawks that shipped had labeling implying both were V2.4.8 but when I cracked opened the FMUs and looked at the circuit board, the new FMUs read as V4.3.6 & V4.3.7.

It gets more interesting, when I open QGC and plug in the new Pixhawks to load the firmware setup the prompt reads:

Found device: PX4 FMU V2  
Connected to bootloader:  
Version: 5  
Board ID: 255  
Flash size: 2080768

I understand that I could go to advance settings and open/load the v4 firmware from github, but where are the v4 firmware files located? Also, I wonder why QGC FW Setup reads the V4.3.6 & V4.3.7 Pixhawks as v2.

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**Author:** ![roomez](https://discuss.px4.io/user_avatar/discuss.px4.io/roomez/32/5483_2.png) [@roomez](https://discuss.px4.io/u/roomez)\
**Post date:** [October 9, 2021, 10:40am UTC](https://discuss.px4.io/t/fmu-v2-4-8-vs-v4-3-6-v4-3-7-firmware-location-and-more/24437/2 "2021-10-09T10:40:04Z")

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Hi  
if your hardware pixhawk is seri 1. showing version PX4 FMU V2  
more information:

- [Pixhawk 4](https://docs.px4.io/master/en/flight_controller/pixhawk4.html): ` px4_fmu-v5_default`
- [Pixhawk 4 Mini](https://docs.px4.io/master/en/flight_controller/pixhawk4_mini.html): `make px4_fmu-v5_default`
- [CUAV V5+](https://docs.px4.io/master/en/flight_controller/cuav_v5_plus.html): `make px4_fmu-v5_default`
- [CUAV V5 nano](https://docs.px4.io/master/en/flight_controller/cuav_v5_nano.html): `make px4_fmu-v5_default`
- [Pixracer](https://docs.px4.io/master/en/flight_controller/pixracer.html): `make px4_fmu-v4_default`
- [Pixhawk 3 Pro](https://docs.px4.io/master/en/flight_controller/pixhawk3_pro.html): `make px4_fmu-v4pro_default`
- [Pixhawk Mini](https://docs.px4.io/master/en/flight_controller/pixhawk_mini.html): `make px4_fmu-v3_default`
- [Pixhawk 2 (Cube Black)](https://docs.px4.io/master/en/flight_controller/pixhawk-2.html): `make px4_fmu-v3_default`
- [mRo Pixhawk](https://docs.px4.io/master/en/flight_controller/mro_pixhawk.html): `make px4_fmu-v3_default` (supports 2MB Flash)
- [Holybro pix32](https://docs.px4.io/master/en/flight_controller/holybro_pix32.html): `make px4_fmu-v2_default`
- [Pixfalcon](https://docs.px4.io/master/en/flight_controller/pixfalcon.html): `make px4_fmu-v2_default`
- [Dropix](https://docs.px4.io/master/en/flight_controller/dropix.html): `make px4_fmu-v2_default`
- [Pixhawk 1](https://docs.px4.io/master/en/flight_controller/pixhawk.html): `make px4_fmu-v2_default`