I can not update it

I can not update from Ver3.4.6 to Ver3.5.1.
Is there a workaround?
The board that I use is Pixhawk.

Resolved by installing the PX4 boot loader.

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same problem, updatet bootloader but no change.
Any other ideas?

force px4 bootloader helps

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I had the same experience: upgrade impossible … unless force px4 bootloader option is selected in MissionPlanner

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It solved the problem by force px4 bootload.