Uncheck the Preloader partition if your device is currently turning on or boot-looping. Flashing an incompatible preloader can permanently hard-brick the device. Only check it if you are repairing a completely dead, hard-bricked phone.
For older models (e.g., Realme C-series, OPPO A-series pre-2021): oppo realme mtk preloader
Software like UnlockTool, MCT, or MRT Dongle, which automate the unbricking process for newer Oppo/Realme security patches. Step-by-Step Guide: Connecting in Preloader Mode Uncheck the Preloader partition if your device is
This is the industry standard for MediaTek devices. It uses a "scatter file" to guide the flashing process. It is best suited for MediaTek-powered OPPO and Realme variants and supports operations like "Download Only" (safe) and "Format All + Download" (dangerous) [13†L18-L23]. For older models (e
Modern Oppo and Realme devices use secure boot servers. The Preloader requires a cryptographic "Download Agent" (.bin file) or an explicit server authentication handshake.
Using it erases the critical NVRAM and NVDATA partitions, which hold the unique IMEI numbers, serial numbers, and calibration data for Wi-Fi and cellular radios. Erasing these without a backup results in a device with no network connectivity. How to Safely Boot into MTK Modes
When the Preloader is completely dead (QHUSB_BULK or 900E mode), you must use a to force BROM mode.