OplusEdlTool is a cross-platform desktop application (Avalonia UI / .NET) for flashing, backing up, and managing Oplus (Oppo/OnePlus) Android devices in Qualcomm EDL (Emergency Download) mode. The tool provides a graphical interface for reading partition tables, backing up individual partitions, merging super partition images from JSON definitions (super_def.json), applying firmware patch files, and verifying file integrity via SHA checksums. It integrates with Qualcomm's fh_loader.exe for low-level device communication and supports Oplus-specific ROM formats (.ofp, .ops). The application stores working data in LocalApplicationData, generates XML partition reports, and includes comprehensive logging. It is bilingual (English/Chinese) and explicitly warns users about dangerous operations like flashing the persist partition.