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The bootloader is locked and I want to flash stock software. The ‘Lock” on a bootloader only prevents you installing non signed firmware like a custom ROM you can still use it to .Next, press and hold the volume up + power button at a time. After that, Connect your Android phone to the computer with a USB cable. Then, browse the flash file in the flash tool and click on the download button. Now flashing starts on your Android phone. Flashing firmware takes 10 to 15 minutes.Method – 2. First, Switch off your Blu mobile, by holding the power button. After that, Hold down the . Volume Down + Power Button or; Volume Up + Power Button ; When you see t Blu Logo screen, release all the buttons.; Afterward, Choose the wipe data/factory reset option, Using Volume Buttons and confirm with the Power button.; .Orro G550 Stock ROM Firmware (Flash File) The Stock ROM (firmware) can be used to reinstall the operating system (OS) on the mobile device. It can be very handy when .Well, you can easily flash stock firmware on your device with the Fastboot commands. This method can be helpful with updating a rooted device, getting Android updates before they are released, and also fixing the bricked phone. In this article, we will be discussing how you can flash stock firmware with Fastboot commands.