I9500 repair network problem

after writing imei box do repair network autoatically, and then baseband and imei gone. I write by another box but it show not registered , when I use repair network again baseband and imei gone. I do these functions on android 4.4.2 and 5, what is problem?

(I prefer original imei but I test cert and box shows cert is not compatible , pls guide me for cert also)