Repair IMEI for N900T

is there away to repair the IMEI on the SM-N900T without having to wipe the security? I been able to change the IMEI on the Note 2 and other phones without having to wipe the security and use a Certificate, are you guys working on something to do it without that or am I doing something wrong?

Also I was able to do it without rooting the phone too on the other phones just not with the newer ones. Is there like a reason why it doesn’t work that way or am I just stupid? (I wouldn’t be surprised if its just me)