Yes; a restore will remove cydia, and in limera1n you may uninstall the limera1n console as well.
Installer has been discontinued. Use Cydia or Icy
To get Cydia on you iPhone, the phone will need to be jailbroken. It depends on what generation iPhone you have and the firmware installed. Every iPhone on 4.1 can be jailbroken using pwnage tool, redsn0w, greenpois0n, or limera1n. I personally have an iPhone 3GS with 4.1 jailbroken with limera1n. Cheers
No. Updating the iPad's firmware will remove any jailbreak that has been installed.
An unlocked iPhone has already been jailbroken. That is the first requirement to unlocking one, it has to be jailbroken first in order for Cydia to be added to the device. Without Cydia the device cannot be unlocked ergo it was already jailbroken before it was unlocked.
Since your itouch has been jailbroken you shouldn't bring it to apple because they might fine you or will not accept it. I would recommend un-jailbreaking your itouch. This seemed to work for me and then all you have to do is wipe it clean and reload the software version you have. Good luck.
You download the software cydia, which is the main jail breaking software. There are a bunch of steps in which you apply it to your iPod, but it can be very dangerous to your iPod, so be careful.
Im not sure what you mean by installer but I assume your talking about apps. If you want to install apps you can download them from the app store and it will automatically install.Or you can download on itunes and sync to iPhone. If you have jailbroken you need to install 'installous' on cydia by adding hackulous as a source . Search how to install installous. For a normal iPhone that hasn't been jailbroken you don't need a extra program. But for jailbroken you need installous. I work for apple California i would know Also don't jailbreak it messes up your iPhone slows it down and voids your warranty.
no unless it has been jailbroken
Basically Cydia Extender is a segment of Cydia Impactor. As in it is a part of the most recent Cydia Impactor release. And also Cydia Extender installs as its individual application on iOS devices such as iPhone/ iPad/ iPod touch. Cydia Extender has been designed to re-sign automatically to the applications that are not downloaded from the original app store. The main feature of Cydia Extender is that when it signed in to an application, it remains signed in for the rest of the time. So you can quickly sign-in to an app automatically whenever you want.
Cydia itself is considered to be safe but apps that you may download via Cydia will not have been checked (as they are from Apple's App Store) and so may compromise your personal information without your knowledge.
A jailbroken ps3 is a ps3 that has been hacked to have the ability to download free games, music, movies, etc. Though I do not recommend doing this, as it will ruin your ps3 and void the warranty provided by Sony.
The fourth generation iPod Touch has not been made yet, and there are several other iPods with a fourth generation, so specific information of the iPod is needed to know whether it can be jailbroken or not.