How to disable Secure Boot on Android: step-by-step guide with warnings

Protocol Secure Boot is a built-in protection for Android devices that checks the integrity of boot files before the system starts. It prevents unauthorized software from running, including custom firmware, modified kernels, or malware masquerading as system components. However, for enthusiasts who want to install, obtain, or flash an alternative OS (for example, it becomes an obstacle. TWRP, get root access or flash an alternative OS (for example, LineageOS), Secure Boot becomes an obstacle.

Disabling this function is not a universal process. It depends on the manufacturer device, version Android, status bootloader (unlocked/blocked) and even the chipset model. In some cases, disabling requires deep manipulations with the firmware, in others it is enough to change the settings in fastboot. This article covers all current methods, including little-known workarounds for devices with a locked bootloader (for example, Samsung Exynos or MediaTek), and also examines in detail the risks - from loss of warranty. before the device bricks.

Before continuing, answer the key question: do you understand exactly why you need to disable Secure Boot? If the goal is just to install the application outside Google Play or remove the bloatware, there are more secure alternatives (for example, ADB or Shizuku). Disabling protection is justified only for advanced tasks related to modifying the system partition.

What is Secure Boot and why is it disabled?

Secure Boot is a mechanism for checking the signatures of boot components, implemented at the hardware level (hardware-enforcedIt works at the device boot stage, even before startup Android, and compares the hashes of critical files (for example, boot.img, recovery.img) with reference values stored in a protected memory area. (fuse or eFuse). If the test fails, the device is blocked or goes into emergency mode.

The main reasons for shutdown:

• 🔧 Installation of custom firmware (LineageOS, Pixel Experience etc.), which do not have the official signature of the manufacturer.
• 🛠️ Obtaining root access via Magisk or SuperSU, since modification boot.img violates the integrity.
• 🖥️ Firmware for alternative kernels (for example, KernelSU or kernels with support WireGuard at the OS level).
• 🔓 Bypassing manufacturer restrictions, such as blocking the loading of unsigned applications or forced encryption.

However, Secure Boot is not only “protection from the user”, but also a barrier against exploits that use vulnerabilities in the bootloader (for example, DirtyCOW or CVE-2023-21085, you deprive the device of one of the key security layers. Moreover, on some devices. (for example, Google Pixel s Titan M2) disabling can lead to irreversible triggering of hardware flagswhich even the official firmware cannot reset.

⚠️ Attention: On devices with chipsets Qualcomm (for example Snapdragon 8 Gen 2) disabling Secure Boot may lead to loss of functionality TrustZonewhich will disrupt the operation of DRM (for example Widevine L1 for streaming in 4K) and some banking applications.

Preparing the device: what needs to be done before disabling

Before you begin manipulations, complete the required steps:

Pay special attention backup. like TWRP (if already installed) or adb backup, but remember: they will not save data from protected partitions (for example, /efs to Samsung). A complete backup may require specialized software such as Odin (For Samsung) or QFil (for Qualcomm).

Check the status bootloader command:

adb reboot bootloader
fastboot oem device-info

If in the response contains the line Device unlocked: false, the bootloader is locked. Unlocking usually erases all data and may require an official key from the manufacturer (for example, for Huawei or Xiaomi).

Manufacturer	Bootloader unlocking method	Does it require an official key?	Does it erase data?
Google Pixel	fastboot flashing unlock	No	Yes
Samsung	Mode OEM Unlock in settings + Odin	No (but requires a Samsung account)	Yes
Xiaomi	Application for unlock.mi.com + Mi Unlock Tool	Yes (link to account)	Yes
OnePlus	fastboot oem unlock	No	Yes
Huawei	Official code via HiSuite	Yes (paid)	Yes

For devices on MediaTek (for example, Realme, Oppo) an additional step may be required - disabling SLA/DAA (Secure Launch Authentication). This is done through the engineering menu (##36446337##) or specialized utilities like MTK Bypass Tool.

Method 1: Disabling Secure Boot via fastboot (for an unlocked one). bootloader)

This is the most common method, working on most devices with chipsets Qualcomm i MediaTek. It assumes that you already have the drivers unlocked bootloader and installed. data-i="145">Steps: ADB/Fastboot.

Steps:

1. Connect the device to the PC and put it into mode fastboot:

   adb reboot bootloader

2. Check the connection:

   fastboot devices

   (the device serial number should be displayed).

3. Disable boot image signature verification:

   fastboot oem disable-verity
   fastboot oem disable-verification

   Note: On some devices (for example, OnePlus) instead of disable-verification is used disable-dm-verity.
4. To completely disable Secure Boot execute:

   fastboot flash disable_avb 1

   (this disables Android Verified Boot 2.0).

5. Reboot the device:

   fastboot reboot

If after reboot the device freezes on the logo or goes to bootloop, it means Secure Boot was critical for your model. In this case, only the firmware will help stock boot.img via fastboot flash boot boot.img.

⚠️ Attention: On devices Samsung with chipsets Exynos (for example, Galaxy S22) commands fastboot oem may not work due to blocking OEM commands in new versions of the bootloader. In this case, you will need a patched one boot.img with verification disabled.

Method 2: Patching boot.img to bypass Secure Boot (without completely disabling)

If completely disabling Secure Boot leads to instability, you can go another way — modify boot.imgby removing signature checks from it. This method is often used to obtain root access without disabling hardware protection.

Instructions:

1. Download stock boot.img for your firmware (can be extracted from the official firmware package).
2. Unpack it using AIK (Android Image Kitchen) or Magisk:

   magiskboot unpack boot.img

3. In a file fstab (inside the unpacked boot.img) find the lines with verify and replace them with disable:

   # Was:
   /dev/block/bootdevice/by-name/system  /system  ext4  ro,verify
   Became:
   /dev/block/bootdevice/by-name/system  /system  ext4  ro,disable

4. Pack boot.img back:

   magiskboot repack boot.img

5. Flash the modified image:

   fastboot flash boot patched_boot.img

This method is less risky than a complete shutdown Secure Boot, but requires updating the patch after each firmware update. Also, it will not work on devices with AVB 2.0 (for example, Pixel 6 and newer), where signature verification is built into the hardware. bootloader.

What is AVB 2.0 and why is it difficult to bypass?

Android Verified Boot 2.0 (AVB) is an improved version of Secure Boot, which uses cryptographic hashes (dm-verity) and hardware keys to verify each block of the system partition. Unlike classic Secure Boot, AVB is not disabled by fastboot commands, since verification occurs at the chipset level. You can bypass it only by patching the kernel or flashing a custom bootloader (for example, for Qualcomm devices - via EDL mode).

Method 3: Disabling Secure Boot on Samsung (with Exynos or Snapdragon)

Device Samsung use their own implementation Secure Boot called Samsung Secure Boot (SB), which is tightly integrated with Knox. It is impossible to disable it using standard methods - you will need to update modified firmware bootloader or use vulnerabilities (for example, CVE-2023-21494 for some models).

Algorithm for devices with Exynos (for example, Galaxy S21, Note 20):

1. Unlock bootloader via OEM Unlock in the developer settings.
2. Flash the patched BL (BootLoader) via Odin in Download Mode. Patched files can be found on the forums. data-i="219">for firmware XDA Developers (look for topics marked [NO SB]).
3. Sew modified AP (system partition) with checks disabled Knox.
4. Use TWRP for firmware Magisk or custom kernel.

For devices on Snapdragon (for example, Galaxy S23) the process is more complicated due to Qualcomm Secure Boot. This can help:

• 🔌Usage EDL mode (Emergency Download Mode) for flashing unsigned firmware via QFil.
• 🔧 Exploiting vulnerabilities in aboot (for example, CVE-2022-20465 for Snapdragon 888).
• 📱 Installing a custom bootloader (for example, LK for MediaTek).

⚠️ Attention: On devices Samsung s Knox 3.7+ (all models after 2020) disabling Secure Boot leads to irreversible activation of the flag RMM State: PrenormalThis blocks the use of Samsung Pay, Secure Folder and some banking applications, even after returning to stock. firmware.

Risks and consequences of disabling Secure Boot

Disabling Secure Boot is not just “removing protection”, but a fundamental change in the device’s security model. Here are the key risks:

Consequence	Cause	Can it be fixed?
Loss of warranty	Manufacturers consider shutdown Secure Boot a violation of warranty terms.	Partially (returning to stock firmware can hide traces, but not always).
Blocking banking applications	Applications (for example, Sberbank Online, Tinkoff) check the integrity of the system through SafetyNet.	Yes, using MagiskHide or Universal SafetyNet Fix.
DRM violation (Netflix, Disney+)	Widevine L1 requires an intact download chain.	No, if damaged TrustZone.
Vulnerability to bootkit attacks	Attackers can flash malicious software boot.img without your knowledge.	No, if not restored Secure Boot.
Unstable operation systems	Some firmware depend on integrity checks.	Yes, by flashing a compatible kernel.

Disabling Secure Boot for devices with hardware data protection (for example, Google Titan M or Samsung Knox). In this case, an attacker with physical access to the device can:

• 🔓 Extract data from the partition /data even with encryption enabled (via cold boot attack).
• 📱 Flash the modified firmware with a keylogger or backdoor.
• 💳 Gain access to authentication tokens (for example, for Google Smart Lock).

If you still decide to disable Secure Boot, follow the rule: never leave the device unattended in public places and use full disk encryption (FDE or FBE) with a strong password.

FAQ: Frequently asked questions about disabling Secure Boot

Is it possible to disable Secure Boot on a device with a locked bootloader?

No, if bootloader is blocked, then commands fastboot oem and modification boot.img will be unavailable. The exception is vulnerabilities in specific models (for example, CVE-2023-33138 for some MediaTek), but their exploitation requires deep knowledge and can lead to a "brick". data-i="290">Will Magisk work after disabling Secure Boot?

Will Magisk still work after disabling Secure Boot?

Yes, but only if you also disabled dm-verity and flashed the patched one boot.img. Magisk it itself does not disable Secure Boot, but only masks the changes from SafetyNet. For full compatibility, use the module Universal SafetyNet Fix.

How to return Secure Boot back?

To do this, you need to flash the stock one bootloader and boot.img via fastboot or Odin. However, on some devices (for example, Samsung c Knox), hardware flags are triggered irreversibly, and full restoration of security is impossible.

Is it true that disabling Secure Boot speeds up boot time? device?

No, this is a myth. Secure Boot adds no more than 1-2 seconds to the boot time, since signature verification occurs in parallel with the initialization of hardware components. A noticeable acceleration can only be achieved by disabling dm-verity, but this is a separate function.

Is it possible? disable Secure Boot on Google Pixel 7/8?

On devices with Google Tensor (for example, Pixel 7, Pixel 8) Secure Boot integrated with Titan M2 —a hardware security module. Disabling it requires the use of undocumented commands. fastboot or vulnerabilities in abootthat are not publicly disclosed. At the moment, there are no reliable methods.