Help repair imei samsung I9195L 4.4.4

Please support I need friends to help me repair the IMEI of this model with the version 4.4.4, I can not give way to the root, and when I try to root of version 4.4.2, do not let me change the IMEI and I always get error in the program, I hope you can help me please.
PS: I should clarify that when I try to degrade to a lower version, either with or octopus odin not left me and I get error.:confused::confused::confused::confused::con fused: