# GPS UBlox F9P Version 1.51 with PX4 Version 1.12 **URL:** \ **Category:** PX4 Autopilot\ **Created:** [June 7, 2026, 8:29pm UTC](https://discuss.px4.io/t/gps-ublox-f9p-version-1-51-with-px4-version-1-12/49068 "2026-06-07T20:29:20Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Siegfried](https://discuss.px4.io/letter_avatar_proxy/v4/letter/s/91b2a8/32.png) [@Siegfried](https://discuss.px4.io/u/Siegfried)\ **Post date:** [June 7, 2026, 8:29pm UTC](https://discuss.px4.io/t/gps-ublox-f9p-version-1-51-with-px4-version-1-12/49068/1 "2026-06-07T20:29:20Z")
 ## Hi everyone, I’m new to this forum and I’ve made a mistake I can’t get out of on my own. I accidentally updated the GPS receiver Holybro F9P from firmware version 1.31 to 1.51 on 10 drones running PX4 1.12. Unfortunately I only realized after the update that the two are not compatible. I have already tried adjusting the baud rates but that didn’t help. With firmware 1.31 everything worked perfectly. I would prefer to downgrade from 1.51 back to 1.31, but unfortunately u-center does not allow a downgrade. Is there any way to go back to version 1.31? Or is there a way to configure firmware 1.51 so that it works again with PX4 1.12? Unfortunately I cannot update PX4 to a newer version such as 1.16, as we are using a special swarm show firmware that requires PX4 1.12. Updating PX4 is therefore not an option for us. **Any help would be greatly appreciated!** Best regards Siegi ---
**Author:** ![system](https://discuss.px4.io/uploads/default/original/3X/7/3/73ce918bdcd64854de904f0c8d9ab70ca9723f2a.png) [@system](https://discuss.px4.io/u/system)\ **Post date:** [September 5, 2026, 8:29pm UTC](https://discuss.px4.io/t/gps-ublox-f9p-version-1-51-with-px4-version-1-12/49068/2 "2026-09-05T20:29:33Z")
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