GPS UBlox F9P Version 1.51 with PX4 Version 1.12

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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