Change my Mpie KK fake kernel

Hello,

I need some help for port a custom rom on my new device. I bought a Mpie M15 from Ali, announced with MTK6595, android 5.0... a scam :(
I made a backup with MTKDroidTools, with report :

MT6572 (MTK6595 is Fake!) ; Model : M15 ; Build number : A100-HYDY 20141126-101633 ;
Android v : 5.0.0 Baseband v: MOLY.WR8.W1315.MD.WG.MP.V43, 2014/09/17 10:10 ; Kernel v : 3.4.67 (root@zy-190-d) (gcc version 4.7 (GCC) ) #1 SMP

I installed after hard work a stable version of Carvil custom recovery for flash another rom.
Finally, i found a custom rom for the Mpie S-168 wich look exactly like mine, i just replaced the boot.img, and it works! It's KitKat.
Now MTKDroidTools said :

MT6572 (MTK6595 is Fake!) ; Model : MP-S168 ; Build number : A100-HYDY 20141126-101633 ; Build date UTC : 20141112-021633 ;
Android v : 4.4.2 ; Baseband v: MOLY.WR8.W1315.MD.WG.MP.V43, 2014/09/17 10:10 ; Kernel v : 3.4.67 (root@zy-190-d) (gcc version 4.7 (GCC) )

#1 SMP

My problem is that i can't install any other KK Custom Roms bcz it seems my kernel is faking my hardware, kernel is fake..

After this day of search, i ask for help on how to change the kernel! I want an honnest phone, not a fake kernel!
I want a real kernel of 3.4.67 on my device ;)
Thanks for your help

NB : -I have all the files of my stock rom with MTKDroidTools, i extracted boot.img, recovery.img.. If anybody want something :p
-i actually follow the @irfanbagus on linux, but it becomes very hard, i don't have the kernel source and im not good on linux.. please help :)