You could write jump drive to a sdcard and boot from the sdcard. Then mount the phone's internal memory on a computer and edit the /etc/shadow file.
Having physical access is a major security problem if you lose phones etc I'd wipe it for security reasons, you have no idea what the previous owner setup.
Having physical access is a major security problem if you lose phones etc I'd wipe it for security reasons, you have no idea what the previous owner setup.