The SDL init path's post-install reboot hit `_exit(0)` after trying sysrq-b + reboot -f. Exit code 0 tells init.sh "POWER OFF, don't reboot", so if the reboot attempts failed, init.sh would drop into its poweroff branch and wait forever instead of trying its own fallback ladder (reboot -f → sysrq-b → halt -f → sysrq-c panic). Route both install paths through ac_reboot() for consistency — reboot(2) syscall tries UEFI ResetSystem first (reboot=efi,cold), then systemctl/busybox reboot fallbacks, then _exit(2) which keys init.sh's reboot branch. Matches what os.mjs's "y: reboot" flow already does. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>