How to solve invalid / error SIM or change IMEI for only android

1ST download and install  Engineer Mode / mtk engineer
2nt open mkt engineer software
3rd click connectivity then
4th  click CDS information
5th click Radio information 
6th click phone 1
7th click AT+ and remove + and then again  add +
8tk FOR 1ST SIM click  at+EGMR =1,7''''
9TH add imei any 15 code   to( =)POINT OF  1,7''(=)''
then 1 space to at +  like (at +egmr=1,7''123456789098765'')
then click SEND AT COMMAND  AND  DONE
10th SAME WORK  FOR 2ND SIM

11TH back and restart your phone