Fix a Samsung Galaxy Boot Loop After the One UI 8 Update
Galaxy stuck restarting on the Samsung logo after the One UI 8 update? Wipe the cache partition in Recovery first, then reflash as a last resort. Steps here.
If your Samsung Galaxy is stuck restarting on the logo after the One UI 8 (Android 16) update, the upgrade left corrupted system cache behind. Wiping the cache partition in Recovery clears most boot loops without deleting your data; reflashing the firmware is the last resort.
Wipe the cache partition first
This clears temporary system files and does not touch your photos or apps. Power the phone off (hold Side + Volume Down until it powers down if it will not respond). Then boot Recovery: on modern Galaxies you connect it to a PC or charger and hold Volume Up + Side. Use the volume keys to highlight “Wipe cache partition,” press the Side key to select, confirm, then choose “Reboot system now.”
| Step | Data safe? | When |
|---|---|---|
| Wipe cache partition | Yes | First move |
| Boot into Safe Mode | Yes | Test a bad app |
| Reflash firmware (Smart Switch) | Usually | Cache wipe failed |
| Factory reset | No | Last resort |
If the cache wipe doesn’t help
Let the phone try to boot a few times — a One UI update sometimes finishes optimizing on the second or third attempt. If it still loops, use Samsung’s Smart Switch emergency software recovery on a computer to reflash the same firmware, which repairs the system without wiping your data in most cases. Keep the phone charged above 50% before flashing.
Last resort, and prevention
If nothing else works, a factory reset from Recovery (“Wipe data/factory reset”) clears it but erases the phone, so only do it with a backup in hand — confirm one exists first, per backing up your Android phone. Once you are back in, a phone that boots but is sluggish or unresponsive is covered in a frozen Android phone, and if it will not power on at all, see a phone that won’t turn on.
Common questions
Will wiping the cache partition delete my data?
No. The cache partition holds temporary system files that Android rebuilds; wiping it clears an update-related boot loop without touching your photos, apps, or settings.
How do I get into Recovery on a modern Galaxy?
Power the phone off, connect it to a PC or charger, then press and hold Volume Up + the Side key until the recovery menu appears. Navigate with the volume keys and select with the Side key.
What if the cache wipe doesn’t fix the boot loop?
Use Samsung Smart Switch’s emergency software recovery on a computer to reflash the current firmware — it repairs the system and usually keeps your data. A factory reset is the last resort.
Can I stop this happening on the next update?
Keep a current backup and enough free storage before you update, and let the phone finish “optimizing apps” after an update rather than forcing a restart, which is when corruption tends to creep in.