Rtc_gpio_pullup_en();

Projects Programming
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Hi All
I am using ext0 for waking up Heltec Lora ESP32 board from deepsleep. Works fine if use HIGH pin (GPIO4) for trigger. If i want change it, to LOW pin trigger waking up i use rtc_gpio_pullup_en(GPIO_NUM_4); command, but nothing happens. Board keeps wakeup all the time byself. If i put external pullup resistor everythig works fine.
Please help. Is it any other way to put internal pullup or maybe some pins not accepting command?
Thanks

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Note:
If I omit command: rtc_gpio_pullup_en(GPIO_NUM_4); there are not any voltage on pin 4 (pin is isolated btw), if I use command: rtc_gpio_pullup_en(GPIO_NUM_4); there is cca 0.5 V on the pin.

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