MT6582 IMEI write with volcano tool(utility version) V3.0.9. Follow the steps:-
Open volcano tool utility version v3.0.9.
Select android, tick on built IMEI, select MODE1/MODE4.
Add IMEI 1 and IMEI 2, then select CPU type (MTK Android). Tick on USB mode then just click on start option.
Remove battery from your mobile and insert USB cable then just insert battery. IMEI write process start and finish. When IMEI success shows on box its done.
If not write or error write IMEI then change MODE 4 and do the same work again. It is 100% tested.
If you select MODE 2 or MODE 3 you need to root mobile then you can write IMEI easily.