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Our extraction method for the M4 file structure is currently incomplete, but our tools are sufficient for extracting apps. You will need scripts from Keitai Scripts on GitHub.
Step 1: assemble_m4.py (backup link)
The assemble_m4.py will divide the regions of the nor dump
python assemble_m4.py <file name>.bin
Example
python assemble_m4.py N506i-2_PF38F4462LLYDB0-f1.bin
Step 2: convertForEmulator_mova_nec.py (backup link)
The convertForEmulator_mova_nec.py script will extract the DoJa files from the regions inside the firmware dump.
python convertForEmulator_mova_nec.py m4_out_dir model_name
Example
python convertForEmulator_mova_nec.py N506i-2_PF38F4462LLYDB0-f1.bin_output N506i