mfastboot_adb (often just called ) is a modified version of Google’s standard fastboot binary. It was originally leaked from Motorola’s internal engineering tools. While regular fastboot obeys strict partition size and signature checks, mfastboot bypasses several of those restrictions, allowing you to flash:
(bootloader) Preflash validation failed FAILED (remote failure) mfastboot_adb
The syntax is identical to standard fastboot. Just replace fastboot with mfastboot : mfastboot_adb (often just called ) is a modified