import os from lpunpack import LpUnpack from ext4_utils import SparseImagedef auto_unpack_repack(rom_path): # Unpack super.img LpUnpack(rom_path + "/super.img", "workspace/")
# Mount each logical partition os.system("sudo mount -o loop workspace/system_a.img system_mount/") # Perform modifications (e.g., delete bloatware) # ... # Unmount and repack os.system("sudo umount system_mount/") SparseImage.from_file("workspace/system_a.img").build("new_system.img") # Rebuild super.img with lpmake os.system(f"lpmake --output new_super.img ...")
auto_unpack_repack("downloaded_rom/")
This is exactly what GUI auto tools do under the hood, proving that automation is just a wrapper around expert knowledge.
❌ Platform Dependency
❌ Incomplete Error Handling
❌ Lack of File Context Management
❌ Super Image Rebuilding Weakness
❌ Antivirus False Positives
The Android operating system's open-source nature has fostered a vast ecosystem of customization, security research, and device repurposing. Central to these activities is the manipulation of firmware packages—commonly known as ROMs. Manual unpacking and repacking of Android ROM images (e.g., system.img, boot.img, super.img) is a complex, error-prone process requiring deep knowledge of filesystem formats, block-based OTAs, and Android Verified Boot (AVB). This paper explores the landscape of automated tooling designed to streamline these tasks. We analyze the architecture of popular tools (e.g., mtkclient, CRB, SuperR's Kitchen), evaluate their underlying methodologies, and discuss the critical security and legal implications of automated ROM modification.
Platform: Windows
Best for: Firmware in "chunk" format (multiple .00, .01 files).
Hovatek’s Auto ROM Unpacker Plus is designed for novice users. It automatically merges split firmware files before unpacking—a task that usually requires hex editors.
Manual methods using lpunpack, brotli, and make_ext4fs are powerful but fragile. One wrong parameter (like block size or sparse flag) results in a bricked device. Auto tools offer: auto tool unpack repack rom android
A: CRB Kitchen and AIK work via Wine. Native macOS tools include UnpackRepackTool (Java-based) and the command-line version of SuperR's Kitchen.
We test a workflow using mtkclient + CRB on a MediaTek Dimensity device:
| Step | Manual Command (Reference) | Automated Tool Action |
| :--- | :--- | :--- |
| 1. Dump full ROM | python mtk rl rom_dump.bin | Single command reads entire flash via BROM. |
| 2. Extract super | lpunpack super.img | Auto-detects slot suffix (_a) and extracts 6 logical images. |
| 3. Unpack system | simg2img system.img raw.img; mount | Converts sparse erofs, mounts using erofsfuse without root. |
| 4. Modify | nano build.prop | Integrated text editor inside CRB GUI. |
| 5. Repack | mkfs.erofs with manual flags | CRB rebuilds using original mkfs options from backup config. |
| 6. Flash back | fastboot flash super new_super.img | Generates flash script automatically. |
Result: Bootable modified ROM achieved in 15 minutes versus an estimated 3–4 hours manually. import os from lpunpack import LpUnpack from ext4_utils