Backup your SD card data to a computer, format the card to FAT32 (using a tool like GUIFormat ), and copy your files back.
Nobody wants to debug this error twice. Follow these golden rules: failed to install cia file 0xd8e0806a updated
Check Your SD Card SpaceThis is the simplest fix. CIA installations require double the space of the file itself: once for the CIA file sitting on the card, and once for the installed data. If your SD card is nearly full, the installation will trigger 0xd8e0806a. Ensure you have significantly more free space than the size of the file you are installing. Backup your SD card data to a computer,
Here’s a short, interesting blog-style post on the topic: CIA installations require double the space of the
Safe homebrewing, and don't forget to make a NAND backup before your next big install!