I had this same problem with my beats studio wireless updating them in the chrome browser on my PC running windows 7. When I started the update, the loading bar would get to step 2, and then interrupted when my beats went into update mode (the 5 LED lights moving back and forth). After unplugging them, my beats became stuck in this mode and could not be reset or turned off unless I let the battery die. And if I let the battery die, they would go right back into update mode when I plugged them back into the charger.
I was able fix this issue by uninstalling the beats updater application on my computer and reinstalling it. After uninstalling, I plugged my beats back into the computer (still stuck in update mode). Then I closed and reopened chrome and went back to the beats updater site to reinstall. Once the beats updater installation was complete, I saw the beats loading circle spinning and the update loading bar jumped right back to step 2 and continued updating the beats firmware until it was complete. I had to rename my beats again after the update completed but my beats are now updated and fully functional again.
Hopefully this can help people fix their beats studios without having to send them to Apple for replacement.