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Format a MicroSD card to FAT32 and write the image file (e.g., cfw-dev.img ) using tools like Win32DiskImager or BalenaEtcher. Configure for M3: Open the BOOT partition on your PC. Locate and edit console.cfg using a text editor.

Open it with a text editor (like Notepad) and change the variable CONSOLE_VARIANT First Boot

Some revisions require specific boot scripts. Copy modules.custom.sh and normalboot.custom.sh into the /variants/m3 folder if provided by your firmware source.