When you are trying to reset sony bravia smart tv to its factory default settings and restore its all settings to its original settings and you are unable to reset sony bravia smart tv using remote or without using remote by using physical buttons on sony smart tv then you need to power reset and hard reset and then reset sony bravia tv.
Below sony bravia troubleshooting guide will help you completely reset sony bravia smart tv and reset if sony bravia tv factory reset is not working issue.
Step 1: Turn on Sony Bravia Smart tv and remove power plug from wall socket
Step 2: Wait for 1 to 2 minutes and then plug back the power cable of sony bravia smart tv to the wall socket and power up sony bravia smart tv.
Step 3: Wait for sony bravia smart tv to completely turn on and then go to settings and then factory reset sony bravia smart tv.
Once you power reset and power up sony tv, then your issue of sony bravia factory reset not working or not resetting to default factory settings issue will be resolved.
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If your sony bravia smart tv is still in the process of resetting (sometimes, it takes longer than as expected time) and it depends on data and storage that you have on your sony bravia smart tv and you need to wait and check.
Sometimes, if the resetting process is taking too much time, you can experience this issue of sony bravia factory reset not working issue as the reset process will be still in progress and you need to wait.
It generally takes a few minutes and sometimes longer than expected time depending on data you have and wait until sony bravia smart tv resets and erases all data and restores its settings to factory default original settings.
You can reset sony bravia smart tv without using remote by using physical reset button located on back of your sony bravia smart tv and simply press and hold reset button on back of sony bravia smart tv for 5 to 10 seconds and wait for sony bravia smart tv to turn off and your sony bravia will reset to its default factory settings and it will turn on.
Step 1: Open settings -> Go to Device preferences
Step 2: Select Reset and Factory data reset and confirm settings sony bravia to its default original settings.
Once you reset sony bravia settings, it will wipe out all data and apps etc and it will restore with its factory default settings and you should only reset sony bravia smart tv if you are having serious issues with sony bravia smart tv.