Most MT6877 devices (Xiaomi, Realme, Oppo) require SLA/DAA authentication bypass:
Download the latest version of SP Flash Tool and extract it to a folder on your PC. Locate the flash_tool.exe application and run it as Administrator. mt6877 flash tool
Because TWRP for MT6877 is rare (check XDA forums), you can use the flash tool to test-build one: Most MT6877 devices (Xiaomi, Realme, Oppo) require SLA/DAA
The tool is safe if used correctly, but dangerous if misused. Dangerous actions (brick hazard):
Safe actions:
Dangerous actions (brick hazard):