This document created at Jul 23, 2024, 11:00:26 AM and modified at Mar 22, 2025, 10:37:56 PM.
In this help document, we will introduce Bootrom (Brom)/ Preloader mode.
Bootrom mode is a special mode on devices equipped with MediaTek (MTK) chipsets. Bootrom mode is commonly known as Brom mode in the industry. This mode is not limited to any brand, meaning that every device using MTK chipset can be booted into BootRom mode.
Since many brands use Mediatek chipsets there is no generic way to boot the phone into Bootrom/Preloader mode. On most Samsung devices you will have to use Testpoint. We understand that this is not convenient, so we developed a solution for booting Samsung MTK devices into Brom mode without testpoint. On Xiaomi, Oppo, Vivo, and Motorola devices you can use button combinations to enter this mode. Usually, you have to turn off your device and hold the volume down or up button and the power button at the same time while connecting the phone to your computer with a USB cable.
In Bootrom mode, Chimera offers a variety of essential functions. Easily remove FRP to bypass factory reset protection and access your device. Perform a "Get Info" to read basic device details. Additionally, you can carry out software updates to recover a bricked device or install specific firmware. There are also some brand-specific procedures, such as Patch IMEI for Xiaomi devices, MDM Removal or Set KnoxGuard Status for Samsung devices.
Recently, manufacturers started to close Bootrom mode with their recent updates, so we had to come up with alternative ways to keep servicing devices with MTK chipsets. On such devices, we use Preloader mode. In Preloader mode we support the same procedures, so you will not experience any downsides of it. To access Preloader mode you will have to reconnect your device when Chimera asks for it.
Oppo in Bootrom Mode: Our software offers comprehensive solutions for Oppo phones, featuring the essential FRP removal to bypass Factory Reset Protection and efficient firmware updates for seamless flashing. Keep your Oppo device running smoothly with our tool.
Xiaomi in Bootrom Mode: Experience effortless Xiaomi firmware flashing and FRP removal with our advanced software. You can also run a Patch IMEI procedure on Xiaomi devices equipped with Mediatek chipsets and unlock your device’s full potential, including the bootloader.
ZTE in Bootrom Mode: Chimera delivers ZTE FRP removal and easy firmware update capabilities. Unleash your device’s maximum capability with our reliable software solutions.
Vivo in Bootrom Mode: Our software provides reliable Vivo FRP removal and firmware flashing functions, keeping your phone secure and up-to-date. Enjoy enhanced performance and authentication features specifically designed for Vivo devices.
Samsung in Bootrom Mode: Connect your Samsung device to execute FRP removal and firmware updates, ideal for resolving bootloop issues and ensuring smooth operation. Our software also includes MDM removal for the majority of Samsung devices equipped with MTK chipsets, Chimera offers a vast database of Samsung firmware available for direct download.
Martview is not our official forum but it can bring help to all our customers, since the questions asked are answered by professionally relevant users and administrators there.
Open forumA continuously updated collection of Test Point photos, PCB Diagrams and Blueprints to help everyone easily find the test point pins on smartphone motherboards - all at one place!
Open Test point libraryThis is our official English-language forum. We recommend it for all of our users, because many problems and errors have been described and answered here over the years.
Open forum