2017-10-29, 11:27 PM
Are you having problems during the upgrade or after? If during it may be your mobile connection. If after, I am beginning to suspect that you have power issues. SD cards are sensitive to brownouts during writes. Perhaps a better power cord would work. Many of the USB cords are crappy. Last year I had fits with file corruption until I bought new heavy duty cables. Now I now longer have those problems. My most recent build from scratch was about two weeks ago (and unfortunately done over mobile).