Google has released the May 2025 security update for its Pixel phones, introducing key improvements in system stability and bug fixes. But buried in the update is a change that may frustrate advanced users: it’s now impossible to roll back to a previous Android version. This move tightens security, but limits the freedom of those who install custom ROMs.
May update enhances anti-rollback protection
The new patch includes an update to the Pixel bootloader that raises the “rollback index”, a version counter that Android uses to block older software from being installed. Once the device has this update, you cannot flash or boot any build of Android 15 released before May 2025. The goal? To stop attackers from installing vulnerable versions of Android that contain known security flaws.
Custom ROM fans may be disappointed
While most users won’t notice this change, enthusiasts who experiment with custom firmware might run into trouble. Many custom ROMs are based on older builds, and those won’t be accepted by the updated bootloader. This effectively blocks the use of some third-party systems unless developers update their ROMs to match the new anti-rollback version.
Security comes at the cost of flexibility
Google’s move aims to reinforce the integrity of the Pixel system, ensuring attackers can’t use downgrade tricks to exploit past vulnerabilities. But in doing so, Google limits user control and customization, a key appeal of Android. The update is already rolling out via system settings and can also be installed manually through Fastboot.