Maybe I don't remember correctly but the Wii U has something similar to wiiconnect24 which let the Wii u download Nintendo related spotpass stuff while turned off/standby it should be in the power options of the console if you disable it the Wii u won't download the update while sleeping but it will start to download it when it is turn on although in this case you could just turn off your modem and get some DNS or url protection in time before it updates itselfIt's pretty fucking insane to me that the console just updates while you're sleeping. Yeah, I should had used DNS or just disabled internet on it, but still.
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It seems CBHC get something wrong when you update the console , it's like it's autoboot function does not work at all so you won't have signature patches/cfw although it seems to be possible to fix this issue but we need to wait a little more because normal haxchi works it is just matter to fix cbhc startup , in any case don't update xdI think all it does kill is access to exploit via Browserhax. Might be wrong but man, I have CBHC installed so better be wrong than correct.