Hi tamn43 !
Please don't open 2 threads for the same problem (you've posted in the thread "bootloop" too).
However, if you have this device : "iPhone 6 clone MT6582, 512MB RAM/8GB ROM" ... download the next firmware:
[Only registered and activated users can see links Click here to register]
Instead, if you have this device : "Sophone i6 Plus 5.5 Inch, MTK6582, 1280×720 HD, 1GB RAM/8GB ROM" ... download the next firmware:
[Only registered and activated users can see links Click here to register]
And then, watch carefully the next video-tutorial (from minute 5:45 until the end of video) to flash the downloaded firmware:
:-)