I can't find the model number. i posted this question about 4 years ago. looking at my posts now. much obligedIf you used the wrong firmware it would probably not work.
There are 3 versions of the GC model, each with their own firmwares, the 2 latest ones as i recall the newest firmwares are from 2019, the ? is if your model are a V2 or a V3 model.