- Phones and tablets
- Android phones and tablets
Lock bootloader to fix issue
Google Play "Lock bootloader to fix issue" on Android: unlocked bootloader
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Low
Quick answer
The device fails Play Protect certification because its bootloader is unlocked. Google says to lock it by following your device manufacturer's instructions for your model; back up your data before you start.
Safety first
Stop and check this first
- Locking the bootloader while a non-original system is installed can leave the phone unable to start. Use only the manufacturer's procedure and back up first.
Safe checks you can perform
- Confirm the message in Play Store
- Manufacturer's official instructions
- Run the check again
Leave these tasks to a qualified professional
- Do not attempt this professional task: Manufacturer service
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Manufacturer service
What they doLocks the bootloader and, if needed, reinstalls the model's official software with its tools.
They must show youthe bootloader state and installed software version at the end.
In writingwhich software was installed and whether data was erased.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Confirm the message in Play Store
No special tools
Procedure
- Who:
- you.
- How:
- open Play Store, Profile, Settings, About and tap Fix device issue.
- Result that matters:
- the message is exactly "Lock bootloader to fix issue".
- If it is another message:
- follow the page for that message.
- If it is this one:
- the fix is the manufacturer's procedure.
- Evidence to keep:
- a screenshot of the message.
Evidence: Google Play Help - Check & fix Play Protect certification status
- 2
Manufacturer's official instructions
No special tools
Procedure
- Who:
- you, if you feel able, or the manufacturer's service.
- How:
- in Settings, About phone, Model & hardware, note the manufacturer and look on its support site for how to lock the bootloader on your model.
- Result that matters:
- the instructions come from the manufacturer and match your exact model.
- If they exist and the installed system is the original one:
- follow them after a backup.
- If the system is not the original:
- the official software must be reinstalled first; see "Reset device to fix issue".
- Evidence to keep:
- model, link to the instructions and backup date.
Evidence: Google Play Help - Check & fix Play Protect certification status · Android Help - How to contact your device manufacturer or mobile carrier for support
- 3
Run the check again
No special tools
Procedure
- Who:
- you.
- How:
- after locking, go back to Play Store, Settings, About and tap Fix device issue.
- Result that matters:
- whether the status changes to certified.
- If it does:
- the bootloader was the cause.
- If another message appears:
- follow that page.
- Evidence to keep:
- a screenshot of the final status.
Evidence: Google Play Help - Check & fix Play Protect certification status
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Phones and tablets
- Brand
- Google Play
- Product type
- Android phones and tablets
Known code variants
- Bloquea el bootloader para solucionar el problema
- bootloader desbloqueado Play Protect
- Lock bootloader
- unlocked bootloader Play Protect
What it means
A message from the Fix device issue table for Play Protect certification. Google explains that the device failed the checks because its bootloader, the program that starts the system, is unlocked, and that you need to lock it to improve the device security state. The procedure depends on each manufacturer. The message describes a boot setting, not a fault.
Warnings and stop conditions
- Higheditorial warning
Locking the bootloader while a non-original system is installed can leave the phone unable to start. Use only the manufacturer's procedure and back up first.
Evidence: Google Play Help - Check & fix Play Protect certification status · Android Help - How to contact your device manufacturer or mobile carrier for support
Symptoms and causes
Probable causes · in order
- Bootloader unlocked by you or someone elseCommon
It was unlocked to install another system or root the device; the message names it directly.
Evidence: Google Play Help - Check & fix Play Protect certification status
- Modified second-hand devicePossible
The alert appears although you changed nothing; a previous owner or the seller may have unlocked it.
Evidence: Google Play Help - Check & fix Play Protect certification status
Virtual technician
Does Lock bootloader to fix issue still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Google Play Help - Check & fix Play Protect certification status
Google · 2026 · official_doc
- 2
Android Help - How to contact your device manufacturer or mobile carrier for support
Google · 2026 · official_doc
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