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Whatyouwantistoeraseallcontentandsettingswhichreturnsthedevicetothesetupassistandwiththecurrentfirmwareandsoftware.,UsetheFinderonaMac(thathasbeenupdatedtoCatalinaornewer)torestore,sync,andbackupaniPhone.,PressandquicklyreleasetheVolumeDownbutton...。參考影片的文章的如下: