My rasspberry pi dosent let allow to use /dev/tt0 port

General Discussion
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Basic Information:

Printer Model: ender 3
MCU / Printerboard: crealty v4.2.7
Host / SBC raspberrry pi
klippy.log
klippy (1).log (84.3 KB)

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
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Describe your issue:

the mcu has a premission denied error for /dev/tty0 port

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