The error occurs when the Nintendo 3DS's Application Manager (AM) module fails to verify the certificate signature or hash of a CIA file . This essentially means the file is being rejected because it is recognized as invalid or altered during the installation process. Error Breakdown Result Code : 0xD8E0806A Module : AM (32) (Application Manager) Summary : Invalid Argument (7) Description : Cert signature or hash check failed (106) Primary Causes
The CIA itself may have been poorly "dumped" or converted, leading to an invalid signature. Step-by-Step Fixes 1. Redownload the CIA File failed to install cia file 0xd8e0806a
: The file may have been corrupted during the download, especially if the connection was unstable or the download was interrupted. The error occurs when the Nintendo 3DS's Application
If you are attempting to install the application itself and getting this error, your system is not yet modded. You cannot install a CIA file (including FBI) on a stock, unmodded 3DS. Step-by-Step Fixes 1