We DO NOT RECOMMEND upgrading the firmware on your gimbal as it will reset the Gimbal configuration and you will have to start from scratch to reprogram the gimbal. Even if you have saved your previous PID profiles, the new firmware requires an entirely new profile that is specific to that exact firmware version. More than likely your PID Profiles that were saved using a previous firmware will not work correctly with the new firmware.
If you do not know how to Tune your own system from scratch, we recommend downgrading the firmware back to the original version, and restoring the Default Profile.
If you have a Gimbal with Encoders this will especially be difficult to revert. Encoders are tuned specifically for each motor for each gimbal assembled. These settings will not translate to other gimbals exactly.