Hi, guys. Just a few questions:
1) I saw this on KOreader's github installation guide.
"IMPORTANT NOTE: Switching your device to USBMS mode (by plugging it to a computer over USB) while KOReader is running is entirely unsupported, and risks crashing in fun and interesting ways, both KOReader, and possibly the Kindle's underlying system. Recent KOReader versions make an attempt at avoiding complete and utter mayhem, but it's still not recommended to try to test that theory

. If you need to charge your device while KOReader is running, either do it with a charger, or switch your device to USBNet mode first."
Can someone explain it better the USBNet part? How switch to it and exit from it as well.
2) The JB process went without a hitch. Is it safe to register the device again so i can get back the books sent via e-mail before Jailbreaking the device?
3) Will i still be able to email books like before?