Did it just brick on its own or were you doing any mods with it? I assume that you do not have a backup of the firmware. Unfortunately, it doesn't look like you can use a backup from another Wii U console without a risk of making the situation even worse for your console and making it unrestorable. I don't have much advice for you here, it really sucks if you can't get support from Nintendo/Gamestop to get this working again. If the Gamestop option doesn't work for you, it may be cheapest for you just to buy another Wii U console used on ebay.
That said, if I were planning to actively game on the Wii U, especially in this era of low-support from Nintendo, I would look up one of the tutorials on creating a NAND backup of the Wii U firmware while the console is working and keep the backup on hand for the future in case something ever happens to the console. When it comes to retro gaming, I personally prefer gaming on consoles such as the Gamecube and earlier partly because there is just a lot less that can go wrong with the hardware and the fixes generally tend to be a lot simpler when something does go wrong. There is also a surprisingly vibrant mod communities out there for older consoles such as the N64 and Super Nintendo that provide a lot of support especially when compared to the Wii U.
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