Your phone will eventually reboot and you will be briefly greeted by a warning that the system could not check for corrupt files, which is an expected consequence of the process. (slashgear.com)
For a smooth experience, ensure you have a steady internet connection not to corrupt the files during download. (gamecmd.com)
fsck may find bits of «orphaned» or corrupted files in the file system. (howtogeek.com)