No... it completely resets to original state (or last firmware update if one has been performed) including wiping memory. Involves pressing reset and then a combination of buttons dependant on which Sony being reset... look in the manual for your Sony or check here
https://www.mobileread.com/forums/sho...d.php?t=112522
Vivian, as your device says Kobo, not having one, I can't comment on relevance for that device but if that's all you've got then ask/check in the Kobo sub-forum for similar info...