The chance is close to zero but it is there. EDIT: One last thing that comes to my mind: NUSspli used a buggy and deprecated rendering backend in the past which could cause the weirdest things, so maaaaaybe it corrupted CafeOS and that's why you got corrupted installations. Next time use the edit button instead of double-posting, please. That's why you want to have auto updates enabled. Also maybe try another HDD - maybe it's just showing signs of old age (could you check S.M.A.R.T. You are using a Y cable, right? Try to connect the power only USB to a powerfull wall charger instead of another port of the Wii U and report back if it helps, please. That said I don't think NUSspli did anything wrong here but your HDD has an issue. app files, so it shouldn't be possible to install the files at all. A corrupted download should either trigger an error when verifying the hashes or when decrypting the. Then it asks CafeOS to check and install the files. h3 files, which are hashes to verify the file integrity of the. app files - which are the decrpted game content - and. That's weird because technically it's not NUSspli verifying and installing the downloaded files but CafeOS itself (just like it's done with the eShop).