Odin, always "complete(write) operation failed"!

Whatever i try to do with Odin, installing twrp or cf-autoroot or even a stock firmware, i always get a "complete(write) operation fail".
What could be the problem?

It's a G900F from Poland, branded by the telecom provider "Plus", with a XXU1BOJ1 firmware. CSC is PLS. Reactivation lock off and usb debugging on.

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