Error while porting ROM

Hello Everybody !

I've started to work on my phone which is the Archos 45 Hélium 4G to port ROMS from his clone , the K-touch 2
I ported some ROMS, but now, i want to port MIUI V6 from the K-touch 3, which has the same CPU-GPU. The only difference is his screen, battery and camera

So I followed a small guide en.miui.com/thread-70745-1-1.html
I encountered some problems: - There is not BOOTCLASSPATH row in my boot.img, so i've just replaced the Device Tree from the stock ROM
- While flashing the zip, i have an error : " flash zip failed 'pathofthezip ' "

I did a logcat to understand where is the problem, the first logcat gave me: - exec '/system/bin/sh' failed: No such file or directory (2) - ( I couldn't enter ADB shell because shell was deleted while installing the ROM )

So i flashed the stock ROM ( cM11 ), and tried again to flash my ported ROM, same error but the logcat gave me this: /system/bin/sh: exec: line 1: logcat: not found ( but i could use adb shell command )

I thought that the problem was the updater-script, but i didn't see any errors.
I've also tried with a different update-binary, same error

If you want the ZIP, ask me i'll give you the link, thanks in advance