Reset and restarting sony Xperia - Sony ST21i Xperia Tipo Black

system ui crashed and wont turn on - Sony - Comunidad

Sony https://community.sony.es > m-series > td-p
... Xperia Companion. This will do a clean installation of the latest ... August 2017.

August 2017. Keep getting " unfortunately UI has stopped working" message.

..

hi there.
not sure if this is your phone as you did not give model number.
but try this.
First method:

1. In order to switch off the phone hold down the Power button for a short while.
2. Afterwards go to Settings and then to Backup & Reset.
3. Then selec Factory Data Reset and tap Reset Phone.
4. Choose Erase Everything if you are sure you want to clear all your data.

More items...

SONY Xperia XA F3113 - How to Hard Reset my phone - HardReset.info

www.hardreset.info/devices/sony/sony-xperia-xa-f3113/
or this one.
Restarting andresetting your device Sony Xperia XA support Canada English
or this.
Restarting resetting and repairing Sony Xperia XA support English
or this.
SONY Xperia XA F3113 How to Hard Reset my phone HardReset info

Soft Reset

If your Xperia Z Series is frozen and not responding when pressing on buttons or tapping the screen, try a soft reset. A soft reset will not wipe any data from the device.

1. Open the SIM card door cover on the side of the phone.
2. Use the end of a paper clip to press the small "OFF" button until the device vibrates. The Xperia will shut off, allowing you to restart.

Hard Reset

If you wish to return your Sony Xperia Z Series smartphone to factory default settings, a hard reset is the answer. If you perform a hard reset, it will wipe all data and settings from the device. You may wish to perform these steps if you've been experiencing lock ups or other types of malfunctions, or if you will no longer be using the device.
Note: If you think you may need any information stored on the phone in the future, be sure to backup the data.

Option 1 - Hardware Buttons

1. With the device powered off, press and hold "Power" and "Volume Down".
2. When the "Sony" screen appears, release both buttons.
3. The Recovery screen will appear. Use the volume buttons to toggle the selection to "Factory Reset", then press "Power" to select.
4. Use the volume buttons to toggle the selection to "Yes", then press "Power" to select.

Option 2 - From Android OS

1. Open "Settings".
2. Select "Backup & reset".
3. Tap "Factory data reset".
4. Select "Reset phone".

The Sony Ericsson Xperia Z Series will then go through the process of formatting the memory. Wait for it to restart and factory default settings will be restored.

restore settings

or this one note all data will be deleted

How to Soft Reset or Reboot or Restart SONY XPERIA T LT30p ?
To soft reset SONY XPERIA T LT30p, press the POWER BUTTON KEY for several seconds, we will see the menu to restart or turn off. Choose restart/reboot than the SONY XPERIA T LT30p will do the soft reset or restart. This is safe to do because non of important data or applications will wipe or erase.
#Option 1, Hard Reset SONY XPERIA T LT30p with Software Menu :

1. Make sure the battery is charge properly
2. Turn on SONY XPERIA T LT30p smartphone
3. Don't forget to backup all important data
4. Go to menu: Setting > Backup & reset > Factory Data Reset > Erase internal storage > Reset Phone
5. Choose Erase everything to continue and confirm you ready to do the format SONY XPERIA T LT30p
6. The SONY XPERIA T LT30p will continue the step until ready to use in clean factory default.

#Option 2, Hard Reset SONY XPERIA T LT30p with Flashtool applications:

1. Flashtool in the applications from Sony can be download from Sony website.
2. Flashtool software need to installed in you computer and ready with USB data cable
3. Make sure SONY XPERIA T LT30p battery is charge properly or full charge
4. Power off SONY XPERIA T LT30p
5. Boot SONY XPERIA T LT30p to flashmode with using: Volume Down Button and connect to USB cable at No.1 above
6. Follow the menu at you computer display, it is easy to understand the steps.

#Option 3, Hard Reset SONY XPERIA T LT30p with Hardware Key Button:

1. Make sure the battery fully charge
2. Do not forget to backup all important data
3. Turn off the SONY XPERIA T LT30p
4. Press and Hold together: Power Button + Volume Up Button for several seconds
5. Follow the menu at LCD screen to continue the hard reset SONY XPERIA T LT30p

You can choose the step options above to do hard reset while the SONY XPERIA T LT30p get problem or not running well. But we always suggest to do routine backup before your smartphone get problem. If SONY XPERIA T LT30p already stuck or run slowly or not responsive, then better try to do backup as you can because all important applications will be wipe or removed from SONY XPERIA T LT30p after doing master reset, but some data which saved at memory card will be safe, better to remove the microsd memory card before doing the hard reset.

Dear Mate,

Restarting or resetting your phone is a different thing.

Here is the process to hard reset:

1. Hold both the volume up key and the power key simultaneously for 5 seconds.
2. After your phone vibrates once, release the keys and let it power on.

As i am bit confused that you want to use t-mobile sim. What i can guess from your question is that you want to unlock your network, If that is the case then http://www.guaranteedunlock.com/ is the best choice or you can also try ImeiNetworkUnlock com these 2 companies are best in mobile unlocking.

To soft reset SONY XPERIA T LT30p, press the POWER BUTTON KEY for several seconds, we will see the menu to restart or turn off. Choose restart/reboot than the SONY XPERIA T LT30p will do the soft reset or restart. This is safe to do because non of important data or applications will wipe or erase.

solution 1, Hard Reset SONY XPERIA S LT26i with Software Menu :

1. Make sure the battery is charge properly
2. Turn on SONY XPERIA S smartphone
3. Don't forget to backup all important data
4. Go to menu: Setting > Backup & Reset > Factory Data Reset > Reset Phone
5. Choose Erase everything to continue and confirm you ready to do the format SONY XPERIA S
6. The SONY XPERIA S will continue the step until ready to use in clean factory default.

solution 2, Hard Reset SONY XPERIA S LT26i with Flashtool applications:

1. Flashtool in the applications from Sony can be download from Sony website.
2. Flashtool software need to installed in you computer and ready with USB data cable
3. Make sure SONY XPERIA S battery is charge properly or full charge
4. Power off SONY XPERIA S
5. Boot SONY XPERIA S to flashmode with using: Volume Down Button and connect to USB cable at No.1 above
6. Follow the menu at you computer display, it is easy to understand the steps.

solution 3, Hard Reset SONY XPERIA S LT26i with Hardware Key Button:

1. Make sure the battery fully charge
2. Do not forget to backup all important data
3. Turn off the SONY XPERIA S
4. Press and Hold together: Power Button + Volume Up Button for several seconds
5. Follow the menu at LCD screen to continue the hard reset SONY XPERIA S

Be careful before doing this step to master reset, because all important data and applications will be removed from SONY XPERIA S, we always suggest you backup all important data before performing the hard reset.

take out the battery and hold your power button for a while.. this s memory reset... then put the battery and power on... it will on.. then factory reset... problem solved

my phone model : sony ericsson xperia lt18i arc s white i am forget password.i want to give soft reset.

resetting to factory settings your phone may fixed the problem but please be aware that all your recently data or contacts may be delete.