I see ok you have a MT6582 good but is this a( HDC SM-N910F clone) or ? ????????????
If it is you can use this rom
[Only registered and activated users can see links Click here to register]
100% working
then you can root it I used Kingo ROOT . ok your rooted but your not done
I don't like Kingo it was just a ez root .lololol
USB debugging is on / media device set as MTP .
1. go to the play store get super-SU install it
2. play store get file exploer and the root add on install them
3. run super SU and and kingo will pop up as root the click at the prompt grant this is so SU can update .
4. uninstall kingo /
5. run file exploer in that go to system root . them mount system as R/W . this is fun lolol
go to system then app go down you see kingo apk delete .reboot by by bull sh*t
6. ok to fix your IMEI you can get that under your battery . go to the phone pad
type *#*#9228#*#* go down you see IMEI click it and put yours in click write .
reboot . all is good