iPod software is updated by plugging the iPod into the computer and using Apple iTunes software to upgrade.
The software updates for the iPod Touch are free (See links below).
Yes, the jailbreak will be lost. When you upgrade your iPod Touch software, it is completely reinstalling the software used to run it. When you jailbreak an iPod Touch, you are only jailbreaking the software, not the actual iPod.
No, you cannot upgrade the software on your iPod touch using a PS3. You need a computer.
This means you have to update your software on your iPod Touch. You have too old of a software to run the apps (you are possibly running the 1.0 software). Upgrade to at least the highest upgrade of 2.0 software.
The iPod Nano version 1.0.4 is just an upgrade version of the iPod software, and just fixes minor bugs that have occured in the earlier software.
Yes, all iPhone and iPod Touch models use the same operating system, meaning the same software updates.
Your software may be too out-of-date. Upgrade the iPod Touch software to the latest version of its kind.
If you can't access apps on the iPod Touch, then you should try updating the software version of your iPod Touch to the latest version.
You have to pay the $9.99 to upgrade to iPhone 2.1 software version. http://www.apple.com/ipodtouch/softwareupdate.html Then you can load apps on your iPod Touch.
you have to upgrade the iOS to 2.2 or above
The iPod Touch software may be out-of-date or may be too new. iPod Touch apps have been known to not open if you do not have the minimum latest version of the 2.0 software, and certain apps will not open if you have 3.0 or 3.1 software.