File Diag Mode Unlock Tool
Some tools contain a downgraded, leaked "engineering" firmware from the factory. This firmware has Diag Mode wide open. The tool temporarily flashes this firmware into a different partition (like modem or dsp ), enables the diag port, and then allows you to run your desired commands.
In Diag Mode, a device can:
Tools like UnlockTool and Chimera Tool offer integrated Diag Mode features: file diag mode unlock tool