To flash a factory image wiith this tool i need of a fastboot stock rom, unfortunately oneplus doesn't release it and i have not op5t or op3t to test it. At this moment there are 2 versions not fully working for op5t and 1 not tested for op5. All fastboot roms fully compatible with this tool (op5t and op5 in testing included) are here: https://mega.nz/#F!AbRT1SbY!7ApCfIohKItBzv-uyOU7xwwhy does it show (Stock firmware not found for now) in the device list (for op3-op5t)? @mauronofrio