I have a xaw-1002 switch and I installed custom firmware an SD card to hack it. I am planning on selling it and want to revert into a stock switch. Can I just remove the SD card, format the card and the switch, and everything is stock? I do not believe I changed the sysnand at all, but I could be mistaken as I hacked my switch a while ago. How do I check if I changed anything there or will a factory reset revert it anyways?