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I decided to start monitor mode on my Raspberry PI0 but I messed up somethings afterwards and decided to reinstall kali linux but after reinstalling it I was not able to connect to the internet and when I checked for wifi adapters using ifconfig I saw 3 devices there-1)lo 2)wlan0 3)mon.wlan0 I looked up the internet for solutions and found out that I would have to close monitor mode to connect to internet but I am not able to do so as its a fresh installation. iwconfig wlan0 mode managed doesn't work. Help would be appreciated.

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As far as I understand your question you want to enable monitor mode on your wifi device. With kali linux I cannot help you because I don't use it. But the wifi device on your RasPi must support monitor mode in general. As far as I know all wifi devices on the RasPis have similar options. I don't have a RPi0W but on my RasPi 3B+ I find this modes:

Supported interface modes:
         * IBSS
         * managed
         * AP
         * P2P-client
         * P2P-GO
         * P2P-device

There is no monitor mode supported and I don't believe it is supported on a RPi0W. Check it with:

rpi ~$ sudo iw list

You will get a bunch of information. Look at the Supported interface modes. If you do not find monitor then you are lost. You have to buy an USB wifi dongle that supports monitor mode. For example my dongle shows this:

Supported interface modes:
         * IBSS
         * managed
         * AP
         * AP/VLAN
         * monitor
         * mesh point


UPDATE:
I have found this answer to Does the BCM43438 WiFi chip in Raspberry Pi 3 support “monitor” mode. With the nexmon project it is possible to patch the firmware for the wifi chip to use monitor mode and other extensions but you have to compile the driver.

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