sleepcover is merely rocket science but just using magnet to trigger the built in magnetic switch.
here is the update reply from kobo:
Hello there,
I am sorry to hear that your device issue hasn’t been resolved yet. I would like to suggest these following steps to reset your device.
Before attempting the below steps, please ensure your eReader has been charged for at least three (3) hours. Then try the following.
Simple Reset your device:
You can perform a simple reset on your eReader with the following steps:
1. Hold the power button for 15 seconds.
2. Wait 5 seconds.
3. Hold the power button for 5 seconds to turn it back on.
This will force the eReader to reset with no loss to personal data or personalized settings and preferences.
*** Please try Factory Reset if Simple Reset doesn’t solve the issue***
You can perform a factory reset to restore your eReader to its original settings. After a factory reset, you’ll have to set up and sync your eReader again.
If you perform a factory reset on your eReader, you'll:
• Remove all books from your eReader. Any books you purchased from Kobo can be re-downloaded from the Kobo Cloud after a factory reset.
• Lose any bookmarks and annotations you've made in your books since you last synced your eReader.
• Sign out of your account on your eReader.
• Reset all personalized settings and preferences.
• Return your eReader to its original settings.
If possible, back up any books or documents that you added to your eReader using Adobe Digital Editions, or that you manually added using your computer. You do not need to back up any books you bought from Kobo. Any books you purchased from Kobo can be re-downloaded from the Kobo Cloud after a factory reset.
Go to your Home screen.
Tap Home at the top of the screen.
Tap Settings.
Tap Device information.
Tap Factory reset under Advanced. Tap Reset Now.
If Factory reset doesn’t work or If the screen is not responsive after Simple Reset, please try Manual Factory reset*
If a factory reset didn't solve your problem, you can try a manual factory reset to restore your eReader to its original settings. After a manual factory reset, you'll need to set up and sync your eReader again. Before you start, charge your eReader for at least one hour.
1. Connect your eReader to a power source by doing one of the following:
• Turn on your computer and connect the included USB power cord to your computer first, and then your eReader.
• Plug the wall charger (not included) to a power outlet, and then connect your eReader to the wall charger.
2. Press and hold the power button until the power light on the top-right corner of your eReader turns off. You'll see a 'Powered off' screen when your eReader is turned off.
3. Release the power button.
4. Press and hold the power button on your eReader for 30 seconds.
5. Wait for the Restore screen to appear.
6. Release the power button. Your eReader screen will turn black and begin the restoring process. After the restoring process finishes, follow the onscreen instructions to set up your eReader. You'll need access to an active Wi Fi or internet connection to complete setup. You can also use the Kobo Desktop app to set up your eReader using your computer.
If you have any more questions or require further assistance, please send us an email.
For inquiries big and small please visit us at
http://www.kobo.com/help
Sincerely,
The Rakuten Kobo Team