How o-gs/dji-firmware-tools works
dji-firmware-tools is a collection of DJI drone firmware research, modification, and device-communication utilities. The main file workflow extracts xV4 packages, decrypts or unpacks firmware layers, edits or analyzes modules, and repackages them. Separate branches handle live drone and smart-battery communication, plus capture and protocol analysis. The README documents several format workflows; source excerpts are partial, so uncertain internal calls are not shown.
Main entry points: amba_fwpak.py Ambarella partitions · comm_sbs_bqctrl.py Battery control · dji_xv4_fwcon.py xV4 container · dji_imah_fwsig.py IMaH signing
Components 24
Firmware formats
- xV4 container
dji_xv4_fwcon.py - IMaH signing
dji_imah_fwsig.py - MVFC decryptor
dji_mvfc_fwpak.py - Ambarella partitions
amba_fwpak.py - ROMFS filesystem
amba_romfs.py - UBIFS filesystem
amba_ubifs.sh - Firmware modules
Binary analysis
- ELF converters
amba_sys2elf.py - ARM binary converter
arm_bin2elf.py - Firmware editors
dji_flyc_hardcoder.py - Parameter editor
dji_flyc_param_ed.py - No-fly editor
dji_flyc_nofly_ed.py - Flight log parser
comm_dat2pcap.py
Device communication
- Service commands
comm_og_service_tool.py - Serial tools
comm_serialtalk.py - Battery control
comm_sbs_bqctrl.py - Gauge definitions
comm_sbs_chips
Protocol research
- Packet capture
comm_serial2pcap.py - Wireshark dissectors
comm_dissector/wireshark - Dissector helpers
comm_dissector/helpers
Other components
- Engineer
- Firmware package
- DJI drone
- Capture file
Connections 33
- Engineer → xV4 container: extract or build
- Firmware package → xV4 container: read package
- xV4 container → Firmware modules: extract modules
- Engineer → IMaH signing: decrypt or sign
- Firmware modules → IMaH signing: read IMaH module
- IMaH signing → MVFC decryptor: remove first layer
- MVFC decryptor → Firmware modules: decrypt module
- Engineer → Ambarella partitions: extract or merge
- Firmware modules → Ambarella partitions: read Ambarella firmware
- Ambarella partitions → ROMFS filesystem: extract filesystem
- Ambarella partitions → UBIFS filesystem: process UBIFS
- Engineer → ELF converters: convert binary
- Firmware modules → ELF converters: convert SYS partition
- Engineer → ARM binary converter: convert binary
- Engineer → Firmware editors: edit firmware values
- ELF converters → Firmware editors: supply ELF
- ARM binary converter → Firmware editors: supply ELF
- Engineer → Parameter editor: modify parameters
- Engineer → No-fly editor: edit no-fly data
- Engineer → Service commands: request service action
- Service commands → DJI drone: send commands
- Engineer → Serial tools: communicate
- Serial tools → DJI drone: serial exchange
- Engineer → Battery control: read or control
- Battery control → Gauge definitions: use chip definitions
- Battery control → DJI drone: SMBus or I2C
- Engineer → Packet capture: capture traffic
- DJI drone → Packet capture: serial traffic
- Packet capture → Capture file: write capture
- Capture file → Wireshark dissectors: analyze packets
- Engineer → Wireshark dissectors: inspect protocols
- Dissector helpers → Wireshark dissectors: generate dissectors
- Engineer → Flight log parser: parse flight logs