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@NiLuJe: Thank you for you help, I can see the light at the end of the tunnel! I successfully managed to get rid of the installed jailbreak using the repacked uninstaller. When installing the jailbreak version 0.13 at first I got an error message of U007, but after a restart and another try it created the folders (second time I didn't catch whether it displayed any error message).
Then I tried to install usertts, but it didn't recognize the install file and the update button stayed grayed out. I thought that maybe it wasn't really jailbroken, but the custom screensaver hack installed successfully. After that I tried to install usertts with a repacked installer. The installation finished without problem, but the problem, why I wanted to install it, still persist – if I press the Text-to-Speech 'turn on' button, the rotating progress indicator appears in the top left corner and keeps rotating while the device is frozen. I can't do anything, can't return to the home page, can't enter the menu. Just the hard power switch restart helps.
What can I do with the not working text-to-speech function and why is that I can't install some hacks with their original installer and I have to repack them? (e.g. usertts) I couldn't install launchpad neither, and I couldn't even repack it because its file structure is more complicated.
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