If you have downloaded any apps onto your iDevice via 'Tui' and you can't open the installed apps because you either need an apple ID and Password, or the apps installed from the tui app store keep crashing, don't worry! All you need to do is to install Tongbu assistant for you computer, and you then you need to plug in your iDevice into your computer, open Tongbu Assistant, and click 'Fix Bug', whilst your device is plugged in via USB. This will stop all the apps that you have installed from tui from crashing and any other future ones that you may install. You will only have to do this once, but if for some reason they start crashing again or ask for your apple ID and password then just repeat this step.