Mh4u not working

I try to install CIA but my mh4u is not working and it says fatal errorcitra_log.txt (10.3 KB)

Looks like a corrupted ROM. You’ll have to redump your game. Please refer to our Game Dumping Guides:

Dumping Game Cartridges
Dumping Installed Titles

Make sure your GM9 is updated to the latest version available and that you have enough free storage space available on your SD-Card to perform the dump.

What if I don’t have an SD card? do I need an SD card to perform this?

Well, yes. You’ll need to dump to your 3DS’ SD-Card after all.