The screen will show a progress bar. Do not turn off the power.
Installing a ZXDZ 02 or 03 update on a 01 model can permanently kill the screen or touch response. zxdz 01 android update link
Are you trying to (like Bluetooth or GPS issues)? The screen will show a progress bar
Most manual updates perform a "Wipe Data" factory reset. Back up your apps and offline maps first. zxdz 01 android update link