I used limera1n file and jealbreak'a my iPhone and installed cydia, I added a couple of sources for it, among others installeur or what its called, an app that goes into the appstore and download the app for free via different websites. there was a problem with the networks then, it jammed constantly and it went down in speed. I removed sort of all sources but the problem was still there, so I restored the phone and it works now normal, unfortunately, I can now not unlock it again with limera1n, i try and come only to the stage when I will release power button and hold the home button, but it will be reached on, I hold for 10 minutes and then gave up ..

How can I remove what junk which was inserted via cydia, so I can install it again?

Thanks in advance
PEACE