I got my Raspberry Pi 4 yesterday and have already managed to uninstall the browser. I don't want to go through the kerfuffle of reinstalling everything that I deleted and since I haven't done much on it, I was wondering if there was a factory reset shortcut?
Welcome to the world of Raspberry Pi! Fortunately, the operating system on a Raspberry Pi is typically Linux based, and I assume this is the same for you. If I am understanding your question correctly, then you want to reinstall a browser onto your Raspberry Pi without having to reflash the whole OS. If so, just run:
sudo apt-get install chromium-browser
In a terminal (Ctrl + Alt + T in Ubuntu or just navigate to terminal through the desktop. You will probably have to type
in response to the install request, but other than that, you should be good to go in a few seconds!
If you got one of the Raspberry Pi kits that come with the SD card with NOOBS (CanaKit is the most popular one), you can hold shift as the Pi is booting to be taken to the NOOBS install screen. At that point you can pick whatever version you want to install.
That being said, if you flashed the SD card yourself, you will have to go through the trouble of re-flashing the SD card with the OS version you originally installed (as others have pointed out).