Hard Reset via Recovery — Asus Zenfone 4 Pro ZS551KL
Optimized for Zenfone 4 Pro ZS551KL (Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4)
Factory Reset from Settings — Asus Zenfone 4 Pro ZS551KL
Optimized for Zenfone 4 Pro ZS551KL (Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4)
Enter Recovery Mode — Asus Zenfone 4 Pro ZS551KL
Optimized for Zenfone 4 Pro ZS551KL (Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4)
FRP Bypass (Google Lock) — Asus Zenfone 4 Pro ZS551KL
Optimized for Zenfone 4 Pro ZS551KL (Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4)
Why reset your Asus Zenfone 4 Pro ZS551KL?
A hard reset on the Asus Zenfone 4 Pro ZS551KL fixes boot loops, forgotten PINs and persistent lag. Using Volume Down + Power, you can access recovery mode and wipe the device back to factory condition. Always back up your data first, as a reset cannot be undone.
Frequently asked questions
Will a hard reset delete everything on my Asus Zenfone 4 Pro ZS551KL?
Yes. A hard reset (also called a factory reset) erases all apps, photos, messages, and accounts, returning the Asus Zenfone 4 Pro ZS551KL to its out-of-box state. Back up anything you want to keep before starting.
Does resetting the Asus Zenfone 4 Pro ZS551KL remove the SIM lock or carrier lock?
No. A hard or factory reset only clears data and settings — it doesn't remove a carrier/SIM lock, which is tied to the device's IMEI at the network level. You'd need to contact your carrier for an unlock.
How long does a factory reset take on the Asus Zenfone 4 Pro ZS551KL?
Typically a few minutes, though it can take longer on older or heavily used devices as more stored data has to be wiped.
Will I need my Google account password after resetting the Asus Zenfone 4 Pro ZS551KL?
Yes, if Factory Reset Protection (FRP) is enabled. Android (and HarmonyOS 2.x devices with Google services) will ask for the last signed-in Google account after a reset — make sure you know that password first.
How do I reset my Asus Zenfone 4 Pro ZS551KL?
Use the Hard Reset method above if your Asus Zenfone 4 Pro ZS551KL is frozen or won't respond, or the Factory Reset method if the screen still works normally — both are covered step by step on this page.
Can I factory reset my Asus Zenfone 4 Pro ZS551KL without the password?
Yes — resetting through recovery mode doesn't require your lock screen password, since it bypasses the login screen entirely. That said, Factory Reset Protection may still ask for your Google account credentials afterward as an anti-theft measure.
Does my Asus Zenfone 4 Pro ZS551KL have a hard reset button?
Not a single dedicated button — the Asus Zenfone 4 Pro ZS551KL uses a button combination instead of one labeled "reset." See the Hard Reset section above for the exact keys to press.