Source an official, un-tweaked firmware file exactly matching your hardware variant and re-flash in BROM mode.

"Most shops would tell you this is a paperweight," Elias said, pulling up his workstation. "But we’re going to try something specialized." The Deep Recovery

For devices where standard SP Flash Tool authentication fails, technicians often use paid or specialized tools: Working with SP Flash Tool - GeeksforGeeks

While the initial learning curve regarding drivers, scatter files, and Bypass exploits seems steep, mastering this tool turns a useless paperweight back into a fully functional smartphone. Always remember to download the correct firmware for your exact model number (check under "Settings > About Phone > Regulatory Labels"), double-check your DA file, and never flash the preloader unless absolutely necessary.

The tool will automatically detect the device and start the flashing process (you will see a yellow progress bar). Step 5: Completion

The MT6877 Flash Tool (SP Flash Tool) remains the gold standard for software repairs on Dimensity 900 devices. It is a powerful utility that, when wielded correctly, can save a device from becoming electronic waste. However, with great power comes great responsibility. Always verify your scatter files, ensure your drivers are updated, and never interrupt a flash process once the yellow progress bar begins.