Put everything on to another disk then when you are done put everything back on.
No, even if you factory reset the Galaxy S4 it will not downgrade.
One way to downgrade an iPhone 4 is to go into settings on the phone and reset it to factory settings.
You can get a system restore in Windows 10 in a few ways: reset to a factory settings, from restore pint, from system image, restore system files with sfcscannow and so on.
You will need the key to download and install Windows 8.1 for the Surface Pro after a factory reset. You can call the company and ask for the key.
The only way to get rid of it permanently is to factory reset your phone. Save all your files before doing this. No files will be recovered.
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I would use the windows tool designed by Hansoon2000 a senior member of xda developers. this windows based tool has the ability to install custom recoverys and that will enable you to do a factory reset using the custom recovery method.
Eather go to a professional or when you boot you computer up for windows press factory reset you can also take apart your computer and flick the switch but then your warranty and chance of success diminishes
You can downgrade at this time, you can only upgrade
all the files will be vanished and your phone will be clean.
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