While many tools are used for these tasks, a few are considered the industry standard for MediaTek devices: SP Maui Meta Tool:

MediaTek (MTK) chipsets store device-specific data (IMEI numbers, Wi-Fi/BT MAC addresses, calibration data) in the partition. Corruption often leads to "Invalid IMEI," null baseband, or no network. MTK NVRAM editors allow reading, backing up, restoring, and modifying this partition.

It often requires ADB drivers and the device to be powered on with USB Debugging enabled. 3. SP Flash Tool