They took the drive to a forensic lab run by a friend of a friend, someone who used to teach cybersecurity classes and now offered services to concerned citizens. The technician was young and furious in a gentle way; he unpacked the drive with gloves and a microscope, coaxed an image, and then shook his head. The partition table had been deliberately mangled. Whoever prepared the drive had wanted it to look dead.
After downloading your Vivo_V7_1718_Qualcomm_Dump.7z file, extract it to a folder on your C: drive (avoid spaces in the path, e.g., C:\Vivo_V7_Dump ). vivo v7 dump file