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Most OPPO/Realme phones have a locked bootloader. Flashing TWRP via Preloader without unlocking the bootloader first will result in a "Boot image signature verify failed" brick. You must run fastboot oem unlock first.
during this stage. Without this server-side bypass, the Preloader will refuse to allow the flashing of new firmware to prevent unauthorized software changes. Data Transfer oppo realme mtk preloader
Modern Oppo and Realme devices often enforce strict preloader authorization (OTP - One Time Password) to prevent unauthorized servicing. Most OPPO/Realme phones have a locked bootloader