Please help as I can not pay a forensic data investigator. For a while now I suspect to being spied on my computers and cellphones.
I have two Sony xperia Z3 compact and both were acting strangely lately, so that I have factory reset them several times. I found the reset over the hardware keys Power and volume down, bringing me into recovery mode and reset from there, the safest to delete everything on the phone. If you know a better one I am eager to learn.
For some weeks now this option was gone and strangely on both phones. was not possible any more. The local Sony support could also not explain it or do anything about it and I did not want to send them into a 14 days repair.
Through internet search I found the possibility to enter into recovery mode over my PC with adb commands.
adb devices: was ok and delivered a device.
adb reboot recovery started the device and booted it without showing the options menue it usually does asking if everything should be deleted, cache emptied etc.
adb reboot bootloader error: device '(null)' not found.
Can this be a spyware preventing its own elimination? If yes, how can it be detected and instead of just delete it follow to where it reports to?
Please answer in a way that a tech-dummy understands it.