Tip:
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There is no "Close all" button by default
Tap the "Apps" icon, "Tools" folder, and tap "NeoReader"
Point to the qrcode to read the URL
Tap "Open in browser"
Tap "TaskKiller-1C...seAll.apk"
Tap "Download"
Tap "OK"
Swipe down from notification bar and tap the downloaded file
Install is bloacked by default, tap "Settings"
Scroll down and tap "Unknown sources"
Tap "OK" and you may go to security in settings to turn it off after installed the apk
Tap the "Apps" icon, "Tools" folder, and tap "Downloads"
Tap the downloaded apk
Tap "Install" and tap "Done"
The "Close all" button is still not here
Long press the power key and tap "Power off" and tap "OK" to confirm
After it turned off, press the power key and turn it on
Open some apps and tap the "Recent Apps" button
The "Close all" button placed at the top
All recent apps are closed