Ok, proceed to Plan 'B' then. We can try with a higher version than V3.00.

Open the GVN53 Version 2.50 gupdate.gcd in [Only registered and activated users can see links. ] and change the 'SW Version' to 301, then press the GCD button to save as a new gupdate.gcd:

GVN53 GCD

Put it on the SD and try it.