Open Flashtool and click the icon (the small "X"). Find Xperia Z Ultra (C6802) in the list. Select your region/carrier and download the firmware.
Disclaimer: This guide is for educational purposes. Neither the author nor the website hosts any FTF files. Proceed at your own risk. sony c6802 lock remove ftf
If your phone is locked but ADB debugging was previously enabled, try adb shell rm /data/system/locksettings.db . If not, accept that unlocking via FTF will wipe all user data (photos, contacts, apps). Open Flashtool and click the icon (the small "X")
: If your phone is linked to a Google account and has internet access, you can remotely erase it via the Find My Device dashboard Hard Reset : Use the hardware button combination ( Volume Up + Power ) to enter recovery and select "wipe data/factory reset". Disclaimer: This guide is for educational purposes
using an involves flashing the device with stock firmware. This process effectively factory resets the phone and removes all user data. Prerequisites