iphone 4 should be repaired

[fc0712]

i was having a 4.1 jailbreak and it disappears in 4.2.1 but now it should be repaired how can i delete all track or sign of jailbreak

 

[nebo1ss]

i was having a 4.1 jailbreak and it disappears in 4.2.1 but now it should be repaired how can i delete all track or sign of jailbreak

Do a fresh restore to 4.2.1 and set the phone up as new. There will be no trace of the previous jailbreak.

 

[maturola]

i was having a 4.1 jailbreak and it disappears in 4.2.1 but now it should be repaired how can i delete all track or sign of jailbreak

That is really funny... "It disappears" just like that?? LOL

Anyway.... just do a DFU restore of 4.2.1 and don't restore from backup, take it to the Apple Store just as it comes out from the restore. (I repeat, DO NOT restore your backup). (if you don't know what DFU restore is, quick google search will give you several Step by step)