ChatGPT Raspberry Pi 4 Model B WiFi connect troubleshoot conversation

User:
I want to connect my Raspberry to WiFi but it only says "turn off wireless LAN" and "advanced options".

Assistant:
Are you using Raspberry Pi OS desktop environment? If you open the network icon at the top right, you should see available Wi-Fi networks listed. If not, we can try the command line. Could you tell me the exact model of your Raspberry Pi and which OS version you are using?

User:
When I type sudo iwlist wlan0 scan, it says "interface doesn't support scanning resource temporarily unavailable".

Assistant:
This error can appear if the interface is down or busy. Please try first:
sudo ip link set wlan0 up
then
sudo iwlist wlan0 scan
and share the output.

User:
It shows IEEE 802.11 ESSID: FRITZBOX7490.

Assistant:
Great, it found your WiFi SSID "FRITZBOX7490". Next, try to connect by creating a wpa_supplicant config or using nmcli.

User:
The line with inet 192... does not show when I type ifconfig wlan0.

Assistant:
That means wlan0 does not have an IP address assigned yet, likely because it's not connected. Let's try to connect manually.

User:
When I run sudo wpa_cli reconfigure it says "selected interface 'p2p dev wlan0' FAIL".

Assistant:
The error shows 'p2p dev wlan0' is selected, which is the peer-to-peer interface, not wlan0. Try:
sudo wpa_cli -i wlan0 reconfigure

User:
When I do sudo wpa_cli reconfigure again it says FAIL.

Assistant:
Make sure you specify the interface wlan0 explicitly:
sudo wpa_cli -i wlan0 reconfigure

User:
I typed exactly that but still get FAIL.

Assistant:
Are you sure the wpa_supplicant service is running for wlan0? Let's check with:
ps aux | grep wpa_supplicant

User:
When I run sudo wpa_cli -i wlan0 reconfigure it says "failed to connect to non-global ctrl ifname: wlan0 error: no such file or directory".

Assistant:
This indicates the control interface file is missing or wpa_supplicant is not running properly for wlan0. We need to restart or start wpa_supplicant manually.

User:
On starting wpa_supplicant -B -i wlan0 I get a message about "ctrl iface exists and seems to be in use - cannot override it; delete /var/run/wpa_supplicant/wlan0 manually if not used".

Assistant:
This means there is a stale socket file. Run:
sudo rm /var/run/wpa_supplicant/wlan0
Then start wpa_supplicant again:
sudo wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf

User:
I found the PID and killed the process but the line still remains.

Assistant:
Check if the process is actually gone with:
ps aux | grep wpa_supplicant

User:
There is still a wpa_supplicant process running.

Assistant:
Kill it properly with:
sudo kill -9 [PID]
Replace [PID] with the actual process ID.

User:
After restarting wpa_supplicant I get "wpa state = INACTIVE" and the device address.

Assistant:
INACTIVE state means it's not connected yet. Check your wpa_supplicant.conf and make sure the network block is correct:
network={
ssid="FRITZBOX7490"
psk="your_password"
}

User:
The file already had that, typed it in manually.

Assistant:
Good. Now restart wpa_supplicant and then run:
sudo wpa_cli -i wlan0 scan
sudo wpa_cli -i wlan0 scan_results

User:
Save config failed, I did not understand what you meant by network ID and the number 0.

Assistant:
When you add a network in wpa_cli, it returns an ID, usually 0. You then select that network with "select_network 0" and then enable it with "enable_network 0".

User:
I keep getting the same output.

Assistant:
What output do you get exactly? Is the interface up? Check with:
ip link show wlan0

User:
The first showed state DOWN, wlan0 scan shows nothing.

Assistant:
State DOWN means wlan0 is down. Bring it up:
sudo ip link set wlan0 up

User:
The status does not change with sudo ifconfig wlan0 up.

Assistant:
Try with ip instead of ifconfig:
sudo ip link set wlan0 up
If it still stays down, check for hardware or driver issues.

User:
dmesg shows power save enabled messages.

Assistant:
Power save enabled is normal but does not cause interface down. Check with:
rfkill list
to see if wifi is soft or hard blocked.

User:
The state is still disconnected.

Assistant:
Try to uninstall and reinstall firmware packages:
sudo apt update
sudo apt install --reinstall raspberrypi-bootloader raspberrypi-kernel raspberrypi-sys-mods

User:
Unable to locate package raspberrypi-firmware.

Assistant:
Package raspberrypi-firmware is deprecated, replaced by raspberrypi-bootloader and raspberrypi-kernel packages.

User:
After update, WiFi networks still don't show.

Assistant:
Check kernel messages related to brcmfmac driver to ensure firmware loads correctly.

User:
Kernel logs show brcmfmac firmware loaded and power save enabled.

Assistant:
Firmware seems to be loading fine. Is the WiFi interface listed by nmcli device?

User:
nmcli device shows wlan0 disconnected.

Assistant:
Try to restart NetworkManager and scan for WiFi networks again:
sudo systemctl restart NetworkManager
nmcli device wifi rescan
nmcli device wifi list

User:
No networks are listed.

Assistant:
Is your WiFi adapter SPI or SDIO? You said "I4 is SPI interface".

User:
How can I check which version I have?

Assistant:
Run:
cat /proc/cpuinfo | grep Revision

User:
It says c03114.

Assistant:
Your Pi is a Raspberry Pi 4 Model B.

User:
lsmod shows brcmfmac loaded.

Assistant:
Driver is loaded but wlan0 is down. Check rfkill and ip link status.

User:
rfkill shows no blocks.

Assistant:
Run:
ip link set wlan0 up
and then
iwlist wlan0 scan

User:
No scan results.

Assistant:
Check voltage:
vcgencmd measure_volts

User:
Voltage is 0.8600V.

Assistant:
0.86V is too low for core voltage. Your Pi might have unstable power. Use a proper power supply with 5V and 3A minimum and try again.

User:
Please translate the entire conversation to English and provide as a txt file.

Assistant:
[Providing the conversation as a .txt file]