The SysCFG Writing Utility - UPDATED, OSV
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Short summary:
To enter purple / diags mode, use Purple Pro by 1nsane_dev or a bootbox of your choice from far east...
The app makes it possible to read, write and restore important configuration data on iDevices, making it an important tool for hobbyists and professional repair stores. It requires no accessories except for a DCSD cable / adapter and is therefore much cheaper and faster to use than with conventional NAND programmers from the Far East.
This tool is mostly written in Swift and interacts with the syscfg partition of iDevices. So be careful in usage and make sure you understand what you are doing!
Features:
All you need is Xcode to build the application :) Just download the project and compile or check out our release page...
See the open issues for a list of proposed features (and known issues).