If your file is an unencrypted dump from an emulator environment, the 3DS AM module will reject its signatures. You can fix this directly on your console using GodMode9:
The error message usually looks like this: Result code: 0xd8e0806a Level: Permanent (27) Summary: Invalid argument (7) Module: AM (32) Desc: Cert signature or SHA-256 mismatch (106)
What is the and brand of your microSD card? failed to install cia file 0xd8e0806a
Press on the file and select CIA image options... > Decrypt file .
Now for the actionable solutions. Work through these steps in order from easiest to most advanced. If your file is an unencrypted dump from
Occasionally, the system may throw generic errors if there isn't enough space to both hold the .cia file and its installed contents.
: Open your terminal application and utilize the open-source software command-line utility F3 (Fight Flash Fraud) to run write-and-read tests on the external drive. 4. Backup, Format, and Restore > Decrypt file
The error code 0xD8E0806A indicates a Certificate signature or hash check failure
This error can occur with any CIA file, whether it's a game, an update, or a homebrew app like FBI itself. It often appears during the final stages of installation, right at the very end, which can be particularly aggravating.
This article will provide a deep dive into what this error means, why it happens, and—most importantly—how to fix it permanently.