Bootloader unlocking

⚠️ Article status notice: This article has been marked as incomplete

This article needs additional work for its sourcing and verifiability to meet the wiki's Content Guidelines and be in line with our Mission Statement for comprehensive coverage of consumer protection issues.

This notice will be removed once sufficient documentation has been added to establish the systemic nature of these issues. Once you believe the article is ready to have its notice removed, please visit the Moderator's noticeboard, or the discord and post to the #appeals channel.

Learn more ▼

This Article Requires Additional Verification

---

This article has been flagged due to verification concerns. While the topic might have merit, the claims presented lack citations that live up to our standards, or rely on sources that are questionable or unverifiable by our standards. Articles must meet the Moderator Guidelines and Mission statement; factual accuracy and systemic relevance are required for inclusion here!

Why This Article Is In Question

---

Articles in this wiki are required to:

• Provide verifiable & credible evidence to substantiate claims.
• Avoid relying on anecdotal, unsourced, or suspicious citations that lack legitimacy.
• Make sure that all claims are backed by reliable documentation or reporting from reputable sources.

Examples of issues that trigger this notice:

• A topic that heavily relies on forum posts, personal blogs, or other unverifiable sources.
• Unsupported claims with no evidence or citations to back them up.
• Citations to disreputable sources, like non-expert blogs or sites known for spreading misinformation.

How You Can Improve This Article

---

To address verification concerns:

• Replace or supplement weak citations with credible, verifiable sources.
• Make sure that claims are backed by reputable reporting or independent documentation.
• Provide additional evidence to demonstrate systemic relevance and factual accuracy. For example:
  • Avoid: Claims based entirely on personal anecdotes or hearsay without supporting documentation.
  • Include: Corporate policies, internal communications, receipts, repair logs, verifiable video evidence, or credible investigative reports.

If you believe this notice has been placed in error, or once the article has been updated to address these concerns, please visit the Moderator's noticeboard, or the #appeals channel on our Discord server: Join here.

❗Article Status Notice: Inappropriate Tone/Word Usage

This article needs additional work to meet the wiki's Content Guidelines and be in line with our Mission Statement for comprehensive coverage of consumer protection issues. Specifically it uses wording throughout that is non-compliant with the Editorial guidelines of this wiki.

Learn more ▼

How You Can Help: If this is a non-Theme article (See: Article types):

• Persuasive language should not be used in the Wiki's voice. Avoid loaded words, or the causing of unnecessary offense, wherever possible.
• No direct attacks on named individuals or companies. Malice may be attributed to bad and proven offenders, but only through the use of quotation and citation - never in the Wiki's voice.

If this is a Theme article:

• Where argumentation is used make sure it is clear and direct but not inflammatory. Avoid strong language, or causing unnecessary offense.
• No direct attacks on named individuals or companies. Malice may be attributed to bad and proven offenders, in a formal and calm manner.

This notice will be removed once sufficient documentation has been added to establish the systemic nature of these issues. Once you believe the article is ready to have its notice removed, visit either the Moderator's noticeboard, or the Discord (join here) and post to the #appeals channel.

The bootloader is the core layer of a computerized device that connects the software to the physical hardware. In smartphones, the bootloader allows the mobile device to start up with an operating system such as iOS for iPhones and Android for most other smartphones. Bootloaders are typically established by the manufacturer and shipped to retailers and consumers in a "locked" state, thereby tying the hardware to a specific operating system chosen by the manufacturer. To unlock a bootloader is to disconnect the physical device from a particular operating system, allowing users more control over their purchased smartphones. This is especially relevant for users who wish to de-Google their Android devices, which involves removing Google products and services for privacy, flexibility, and other concerns.

Background

Unlocking the bootloader of a smartphone enables the user to install an alternative operating system on the device, also more commonly known as a custom ROM.

Difference from Rooting

Rooting grants runtime privileges, that is, while the OS is running. BL unlock allows rewriting the storage drive where the OS is installed, but only while the OS is not running. BL unlock enables the user to get root access, either:

• Manually, if the user knows what to do
• Automatically, by using a program

See Jailbreak for more info.

Benefits of unlocked bootloaders

1. Better Privacy

Most custom ROMs do not contain any components that send data to manufacturers, Google, or their partner companies. In some cases, they even contain components that prevent individual apps from doing so, such as:

• /e/'s Advanced Privacy
• CalyxOS's Datura Firewall
• iodéOS's blocker

Workaround Google Play Services

On a default Android system, there is a deep integration with Google Play Services (and Google Mobile Services (GMS)). This is a system process that requires access to files, contacts, storage, call logs, SMS messages, location, camera, and microphone. And without this process running, basic system apps will not function. Alternative systems avoid this process entirely, or use a privacy-preserving workaround such as:

• GrapheneOS's Sandboxed Google Play
• MicroG
• Unified Push

2. Expanding Device Lifespan

Most custom ROMs are free of bloatware and can thus be used to extend the longevity of phones that have become unusable due to the default system growing larger with each manufacturer update. Especially on low-end phones, these updates often exhaust the built-in storage after as little as two years. This renders the devices slow and unstable, leaving no room for user data. Custom ROMs are typically much smaller than the manufacturer's software. Consequently, many old phones can run even faster with a custom ROM than they did when new, thus often more than doubling their useful lifespan.

3. Updates after the manufacturer abandons the device

Low-end devices usually receive only a few years or even months of security updates. Since most custom ROMs are built by the open-source community, installing one of these custom ROMs allows users to receive security updates for the Android system and default components, such as web browser engines and PDF readers, for a significantly longer period than with the manufacturer's OS.

4. Customization

Some applications cannot be removed easily with the default OS. A custom ROM can be used only to include the applications the user wants, potentially with customization options that aren't initially available by default.

Why most devices are locked

Security

A locked bootloader protects the device from what is often called an Evil Maid Attack. This attack occurs when a person with physical access to a device can manipulate the operating system, typically when the device is left unattended or when handed over for inspection by authorities, such as customs, upon entering a country.

A locked bootloader ensures that the operating system remains intact and cannot be altered to deviate from the state in which the manufacturer released it.

DRM and ecosystem control

Some devices hold DRM keys, which are deleted when the bootloader is unlocked. Other devices go so far as to wipe proprietary drivers.

Locks from mobile carriers

Some mobile carriers have completely restricted the unlocking of bootloaders on specific models of cellphones that they sell.

Availability

Unlocking the bootloader is only possible on some, but not all Android devices.

Apple products such as iPhones do support unlocking the bootloader, Instead, People jailbreak their phones with 3rd party software.

Alternative Android-based Operating Systems

These include, but are not limited to:

• GrapheneOS
• IodéOS
• /e/OS
• LineageOS
• CalyxOS

• AOSP (Android Open Source Project) , also known as "stock" Android.