Software on your SONY Xperia Z Ultra C6806 will not be affected by hard reset and will remain the same as before. Related questions: Reasons why you might need to hard reset SONY Xperia Z Ultra C6806?
How to hard reset SONY Xperia 10 III. At the very beginning switch off your phone by using the Power key. After that push and hold Volume Down and Power button for a short while. Release the Power button when the smartphone vibrates and keep pressing the Volume Down solo. In the appeared Recovery mode go to Wipe data/factory reset.

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Method 3. Power off your Sony Xperia Z Ultra, by holding the power button. Hold down the Volume Up + Home + Power Button. After that, release both Buttons while you see Android exclamation mark appears on the display screen. Now you can see Android Recovery Mode, if not (while holding down the Power button press and release Volume Up Button).
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SONY ( LOCK REMOVE FTF ) Xperia T2 ULTRA LTE-A: D5303: VIEW : 4569: SONY ( LOCK REMOVE FTF ) Xperia T2 ULTRA LTE-A: D5306: VIEW : 6260: SONY ( LOCK REMOVE FTF ) Xperia T2 Ultra Dual: D5322: VIEW : 4899: SONY ( LOCK REMOVE FTF ) Xperia Z1 Compact: D5503: VIEW : 4390: SONY ( LOCK REMOVE FTF ) Xperia Z3 Compact LTE-A: D5803: VIEW : 10508: SONY
Click on “Reset options” from this section it will allow us to restore network options, applications or reset the Sony Xperia XA2 Ultra completely. 5- Fifth step: Click on the last option called “Erase all data (factory reset)” or simply “Factory data reset”.
Power on the phone. Then goto Settings -> Backup & reset -> Factory Data Reset -> Reset Phone. Now select option "Erase everything", and confirm that. Done! Rating: 1.0 - 1 reviews. If you found this helpful, click on the Google Star, Like it on Facebook or follow us on Twitter and Instagram. Share.
Perform a hard reset by following the steps below: Power off your device and wait a few seconds. Press and hold Volume Up + Power buttons together until recovery mode screen appears. (These button combinations can When you see the sony logo release the Power button, but keep holding Volume Up