Amazon is great but it is imperative to check 'Sold by Amazon' when you buy a product with a national guarantee, which is the case with Asus, if you can call it a guarantee.
Why be disappointed, you just saved more than 100€, when it's not the Kunai that's broken, it's anyway a firmware update that makes it unusable, which is also true for Aerocooler 6.
And when finally there is a bug-free firmware (vain hope), the accessory is no longer sold, this is already the case for the KUNAI 3 of Rog5 and even worse, a user of ROG 6 with a Kunai 3 of ROG 5 will never be able to use it, as the shell is not manufactured.
Sell your ROG 6 now and forget the ASUS brand, because if you're disappointed now, be brave for the future.