What I tried
Immediately after setting up CFW, use Hekate to back up your and BOOT0 / BOOT1 . Store these backups on two different external drives. This allows you to restore the exact pkg2 partition if it ever corrupts. pkg2 read failed failed to launch hos
Leo closed the laptop lid slowly. He looked at the television. The cursor was still blinking, waiting for an input that would never come. What I tried Immediately after setting up CFW,
Format your SD card to FAT32 , as it is more stable for homebrew and less prone to the corruption that causes pkg2 errors. You can use tools like GUIFormat to ensure it is correctly formatted. Leo closed the laptop lid slowly
The error message (Horizon OS) is a common fatal error encountered by Nintendo Switch users running custom firmware (CFW) like Atmosphère or the Hekate bootloader . It typically indicates a communication breakdown between the console's hardware (eMMC) and the software stored on your SD card. Common Causes of the Error
If you recently restored a NAND backup, ensure you restored BOOT0 and BOOT1 alongside the RAWNAND . A mismatch between these components will prevent the OS from launching.
Likely causes & quick fixes