Since these files are usually shared by independent repair communities, you can search for them on technician forums such as: AliExpress Product Support Pages (often linked in reviews) Repair databases like or Lab-TV
Ensure you have all RAR parts. Use a tool like WinRAR or 7-Zip to extract "part01.rar"; it will automatically pull data from part02.rar to create the final .bin or .img file.
Technical documentation sites like Scribd for board schematics