The error message is a security notification from an Android device's bootloader . It indicates that the device's protection mechanisms are active, preventing any unauthorized modification of the system firmware . What This Message Means
Based on community reports from platforms like the Hovatek Forum and Android Open Source Project , here is how to address this:
: You are likely trying to run a fastboot command while the device is in a state that does not allow modifications . Common Causes & Solutions flashing lock flag is locked. please unlock it first!
Until manufacturers implement better UI flows for security flags, this error will remain a rite of passage for every embedded engineer—a frustrating speed bump that turns a 30-second firmware update into a 30-minute debugging session.
Tap on (or MIUI Version for Xiaomi) 7 times until it says "You are now a developer." Go back to Settings > System > Developer Options . Find OEM Unlocking and toggle it ON . The error message is a security notification from
You’re likely trying to flash something (e.g., via fastboot flashing unlock or a similar command) without first unlocking the bootloader. The device sees the lock flag as “on” and refuses to proceed until you unlock it.
Lock and unlock the bootloader | Android Open Source Project You’re likely trying to flash something (e
In short: Your device’s bootloader is protected by a security "flag" that prevents unauthorized software from being written to the internal memory. To proceed, you must flip that flag to "unlocked."
DLA+ 2.0 Adapter Compatibility Notice
Effective November 2026, DLA+ 2.0 adapters will no longer support vehicle connections within JPRO. After this date, DLA+ 2.0 hardware will no longer connect to vehicles and product support will be discontinued.
As vehicle technology continues to advance, older adapters can no longer support newer communication protocols, increased performance demands, or the latest JPRO capabilities.
To avoid disruption to your operations, we recommend upgrading to the DLA+ 3.0 XBT, which provides faster processing, CAN Bus troubleshooting with JPRO, DoIP support, ongoing firmware updates, and continued compatibility.