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How to reset Samsung Galaxy Tab S2 to factory settings?
Simultaneously press and hold Home button (at the bottom) + Volume up button (on the top-right edge) + Power button (on the top-right edge to the left of Volume buttons) until Samsung logo appears then release. From the Android recovery screen, select wipe data/factory reset.
Why does my Samsung Galaxy S2 keep restarting?
1. CPU Frequency too High By default a brand-new Samsung Galaxy S2 is clocked at 1.2 GHz, Galaxy S3 –1.4 GHz, Galaxy S4 -1. 6GHz, Galaxy S5 -2.5GHz, Galaxy S6 -2.1GHz. Newly purchased phones are prone to this problem as well, without any downloaded app and widget being installed on your two days or a week-old Android phone.
The volume up/down buttons are on the left side of the phone. While pressing and holding the volume up/down buttons, press and hold down the power button. When the Samsung logo appears, stop pressing the power button, while continuing to press and hold the volume buttons.
How to fix Samsung Galaxy restarting randomly problem?
1 Lower the CPU Frequency. To Fix Samsung Galaxy restart loop, you can simply lower the CPU Frequency. 2 Turn off Auto Syncing and Updating. As stated above, sometime updating routinely can interfere with currently running background services and apps. 3 Clear Data in Touch Wiz. 4 Factory Data Reset. 5 Modify Stock ROM.
Can a factory reset change an unlocked phone?
Normally unlocked phones are unlocked for good. I wouldn’t expect a factory reset to change it. (See also: Unlocked Galaxy i7500, Reset Will Remove it?) It’s not 100% certain, though. For example, some Galaxy S users had their phones re-locked when updating from 2.1 to 2.2, which is a somewhat similar process to doing a factory reset.
What should I do if my unlocked phone gets re-locked?
You could always do a backup through ClockworkMod or something (and back it up to your computer first) in case it does get re-locked, so that you could restore it to the previous unlocked state. That requires root, however. (Root can sometimes be undone by a factory reset, but not if you have a custom ROM that came pre-rooted).