best software for restore

Here is how to: Restore your iPhone, iPad, or iPod to factory settings - Apple Support

This article also links to the backup options, and to the restore options.

luisAGH Said:

"best software for restore: wath is the best software for full format and restore? fix lag and low speed in scrolling ios16.6"

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Which iOS to Restore to:

The best software is the latests version. Where you go about installing an update on or restoring your iPhone, only the latest version will install.