Direct support for super.img , payload.bin , sparse images, and ext4/apex/erofs file systems.
: Automatically detects and unpacks super.img , supports ext4 and newer erofs filesystems, and handles sparse image conversions automatically.
If you decide to use it, run the tool inside a and always verify the repacked image with:
Several developers have created powerful, automated kitchens and scripts that handle the extraction, decompression, and rebuilding of these complex image formats. 1. CRB Android Kitchen (Windows) auto tool unpack repack rom android
To repack after modifications, use the lpmake command. This requires specifying metadata sizes, device sizes, slot groups (for A/B devices), and each partition's name, group, and size. The command is complex but well-documented in the AOSP source and in community guides. A typical repack command includes flags such as --sparse (for fastboot flashing), --metadata-size 65536 , --device super:5297405952 , --group slot_a:4001886208 , and --partition definitions for each logical partition with their images.
For the ROM to be flashable via custom recoveries like TWRP, the tool often zips the images and signs them with a test key. Popular Auto Tools
Lightweight, supports many formats, works on Windows, Linux, and macOS. 2. Payload Dumper (Auto Tool) Direct support for super
To understand the tools, one must understand what they are unpacking. An Android OTA zip or factory image typically contains:
The tool will automatically handle the necessary ext4 or erofs compression. Essential Precautions and Best Practices
The tool automates the process of unpacking (decompiling) Android firmware files (system.img, vendor.img, boot.img, super.img) and repacking them into a flashable format. The command is complex but well-documented in the
Load super.img into a tool like CRB Tool. The tool will parse the metadata and extract system , vendor , and product sub-images. Step 3: Decompressing Dat.br into Ext4 Raw Images
A dynamic partition found in Android 10 and above. It houses system , vendor , product , and odm sub-partitions.
The tool will create a "system_folder" containing all files. Step 2: Modifying the Content Once extracted, you can edit the files:
: A script-based tool for Linux environments (e.g., Ubuntu). It is specifically designed to handle modern ROM structures including system.new.dat and system.transfer.list files.
Modern Android devices use A/B partitioning and deliver updates as a payload.bin file. This tool extracts the raw payload.bin to reveal the individual .img files.