[Q] Enginnering mode not working. [IMEI INVALID]

HI devs,

I have Micromax Android One(sprout) with 5.1.x. After flashing STOCK KITKAT by SP flash tool. i lost my IMEI(shows INVALID:crying:).

So i searched a lot for restoring IMEI on MTK devices.(NONE OF THEM WORKED). Listed below tried methods:

> IMEI MAKER (IMEI REPAIRER, IMEI Flashable)
Manually replaced MP0B_001 to NVRAM/X/X/X blah blah
> MKT Droid Tool
followed all steps, inserted my IMEI, still not worked.
> Reflashed KITKAT ROM, CM 12. (Still no progress)

Methods remaining to try is
ENGINEERING MODE

but then i realized my ENGINEERING MODE is not working.

> i tried to open with *#*#3646633#*#*. (nothing happens. dialer clears all numbers)
> Used ROM Toolbox Lite and Mobile Uncle
it shows to options ANDROID and MTK setting
when i click MTK setting it not opens enginnering mode.

So at last conclusion.. my issue is ENGINEERING MODE is not working.

any one have solution for this. . Thanks in advance..:good: