My I337 NB1 AT&T can't/doesn't boot into a Recovery Mode

It can boot into a Recovery Mode using adb but not native/factory.
It is a fake but I found that it is observing a packaging only.
It works perfect excluding a Recovery Mode issue.
It’s interesting that it boots into Download Mode no sweat.
And I found a trick to boot into a Recovery Mode - after pressing “Home”+”Volume Up”+”Boot” it shows Samsung logo than “BOOTING RECOVERY…” but very shortly than reboots and runs a regular system boot. If I’ll catch a moment when “BOOTING RECOVERY…” became hidden and press “Home”+”Volume Up”+”Boot” again phone screen becomes black and than regular Recovery Mode boot starts.
P.S. I forgot to suggest maybe it's a hardware problem.

I'm sorry for my bad English.

Any suggestions please?

Thanks in advance.

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