Jailbroken iPhone 4 from sprint doesn't want to turn on and says no service?

[NeidaAhumada]

I jail broke my iPhone 6 months ago and it work perfectly but I got tired of the jail broke and I wanted to remove it my computer didn't work and I couldn't restart my iphone because it said I had a password and I didn't remember it so I tried erasing everything from iCloud in a lost mode I didn't know it would disconnect my phone and I try turning it on but it only turns on for a couple seconds and says waiting for activation then turns off I try to restore on a friends computer but it doesn't want to connect because it turns off so fast I don't know what to do

[michael]

Reset your iPhone to factory settings. Only way.