If you see “Device not found,” reinstall VCOM drivers or try a different USB port.

Using MTK Meta Utility v51 to change IMEI numbers (including the US, UK, India, and EU nations) unless you are restoring the original, manufacturer-assigned IMEI of that exact device.

: You must have the correct MediaTek USB drivers installed. Often, tools like USB DK or specific MTK driver packages are required for the "Bypass Auth" function to work.

Thirdly, and perhaps most significantly, v51 has adapted to modern authentication protocols. As manufacturers have tightened security, simple command-line interfaces have become insufficient. V51 integrates modern authentication bypass techniques (often utilizing exploit chains like those seen in the "MTP Bypass" landscape) to execute commands even on devices with secure boot restrictions. This allows for the reading and writing of the NVRAM (Non-Volatile Random Access Memory), a critical area for storing radio frequency calibration data and, in some contexts, user-identifiable information.