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I can connect to Wi-Fi when I use RPi 3B but when I boot the system with 3B+ it doesn't connect to Wi-Fi automatically and when I click on the top right to connect it to Wi-Fi, I see the error:

no wireless interfaces found.

We tried

sudo rpi-update 
sudo apt-get update
sudo apt-get upgrade

and some other common solutions on the internet but none of them solved the problem. I can connect to internet via Ethernet but I need to connect to Wi-Fi. I also tried to set the country code but it did not work.

Are there any other solutions we can try?

Ingo
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2 Answers2

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I seems you take the SD Card from the RPi 3B and put it into the RPi 3B+. This cannot work because the RPI 3B+ has new hardware, particular a new wifi chip. This needs new device drivers so it is recommended to use the latest Raspbian images. If you want to update the SD Card from the RPi 3B you can do it as described in Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

Ingo
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The problem was I was running Raspbian Jessie and it was not supported by Pi3B+. Installing the latest version of Raspbian Stretch solved my issue.