The Switch is notoriously picky about SD cards. A failing card, a "fake" high-capacity card, or a filesystem formatted incorrectly (FAT32 is highly recommended over exFAT for stability) can prevent the bootloader from accessing the pkg2. Solving the Problem
Some slow or fake SD cards cause read timeouts. Run a (e.g., 5 MB/s minimum recommended). Warn if speed is too low.
On your SD card, delete the atmosphere folder and the bootloader folder. Do not skip this deletion. Overwriting sometimes leaves old config files. pkg2 read failed failed to launch hos
If a firmware update fails halfway, the system's pkg1 (stored in BOOT0/1) won't match its corresponding pkg2 (stored in the RAWNAND or emuMMC partition).
the /atmosphere and /sept (if present) folders from the root of your SD card. Delete the hbmenu.nro file. Download the latest version of Atmosphere and Hekate. The Switch is notoriously picky about SD cards
During the encrypted multi-stage boot process, pkg1 acts as the primary bootloader stage, which decrypts and hands off execution to pkg2 . pkg2 contains the actual operating system kernel, core system services, and secure monitors required to fully launch HOS.
Delete the atmosphere , bootloader , and sept (if applicable) folders from the root of your card. Run a (e
Always update Hekate, Atmosphere, and your Sigpatches before updating your console's official system firmware.
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