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Hello!
I just tried KtK 0.2.2 on my Zopo ZP950H and installation went well, but after reboot the screen doesn't work (displays gray and black stripes).
The phone itself works, it rings, it locks and unlocks etc.

I search a little and found out it could be boot and uboot fault. So I flashed them from original firmware and it works.

Is it OK what have I done, or should I flash something other?

The rom boots properly, so there's nothing wrong with what you did.
Apparently the zp800h bootloader isn't fully compatible with the zp950;
That, or the bootloader in the ktk rom you downloaded got corrupted when you downloaded it.

Max is right, this is no problem.

It could have been a number of issues. Regardless, this isn't something that will harm your phone or cause a problem assuming it's running fine now.

The GPS on this firmware was amazing. Cold locks within a few seconds.