TWRP stuck at splashscreen

Hi,
On my Mi5 I wanted to put TWRP as recovery in order to flash a custom ROM. Device was unlocked using the chinese dev. rom( checked settings - root access)
I go into bootloader flash the latest twrp 3.0.2-1-gemini and boot into it. Nothing more happens then the splash screen.
Any suggestions what I maybe did wrong? Tried more than one step-by-step guide but can't make it.
Thx

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