I've just updated TCPGecko to 2.5 using the gecko updater and no matter the option I choose (A or X) my WiiU (5.5.1 using Mocha, HBL 1.4) goes to a black screen. The systems does not become completely unresponsive as I can still shut it down from the pad. But it provides no feedback and no error...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced