Hello, this should be ok, so long as you folllow the correct procedure.
I recommend that you raise a support call, and they can look at the config in more detail.
Note that the procedure is different for a virtual appliance, compared to a software install. You may also need to ensure that your root partition is large enough. Also, if you are using an earlier version of Brocade vWAF wth your vTM, then you may need to backup separately before making the change (the support team can also help look at this)