SleepiiV2: Wii U 5.5.2 Exploit at its finest
Remember to purchase and download your Haxchi compatible VC to the internal storage before doing the exploit if you want to install Haxchi. It would suck if it finally worked but you couldn't install Haxchi.
Try the big exploit button a few times first. Clearing your browser save data or choosing another delta might also help. The important thing is to just keep trying
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All the real work was done by the the smart people on this thread's OP