Ok so here comes the detailed instructions on how to upgrade and downgrade the H Plus.
Firstly you need to make sure you download each update as it comes through so that you can copy the files from the 'Yuneec OTA' folder when connected to a PC or Mac via the ST16S.
I saved the very first version 1.08 and also 1.10, I therefore have 2 different types of files to play with.
These are saved as a .Yuneec EXEC file. All of the files that are needed are in these exec files.
To access the files needed copy the exec file so you leave the original alone and then rename the last part .yuneec to .zip, unzip the folder and inside the folder will be 4 files
versioninfo.json------------this file is not needed
Format an sd card into FAT32 so it is completely clean and then drag either the camera.bin to upgrade/downgrade the camera firmware or the gimble.yuneec to upgrade/downgrade the gimble firmware.
Do each file individually one at a time, do not put all the files onto the card at the same time.
Autopilot file you not need to do unless you have wiped off the autopilot from the controller/camera
Insert sd card into the C23 and switch on the H Plus (do not have the controller switched on during this process)
Wait until the camera light goes green and then just to make sure it has finished leave for another 5 minutes
Switch off the H Plus and insert a normal sd card that has been formatted previously in the H Plus, wait for a full boot and then switch on the ST16S to check the file has been up or downgraded.
You cannot check that the gimble has been successful but in my case the vibration has now stopped so I can assume 1.08 did in fact take the downgrade.
To double check I re updated using this method back to gimble 1.10 and the vibration came back, I then downgraded back to 1.08 and viola vibration had gone.
Hope this explains the process good enough.