Select “Misc utility images”, then select “Beta Test Bootloader”. In the Imager application, click on the “Choose OS” button and scroll down the “Operating System” list in the pop-up window.
You should be aware that the SD card you’re using to update your Raspberry Pi’s bootloader will be wiped of any existing data, so you shouldn’t use the SD card you are currently using with your Raspberry Pi. You’ll need a spare blank SD card and, if you’re using a Raspberry Pi or another computer that doesn’t have an SD card slot, a USB to SD card dongle. The easiest way to update the bootloader on your Raspberry Pi 4 or 400 is by using Raspberry Pi Imager, either running on your Raspberry Pi or on another computer, to copy the required software onto an SD card. However, once the beta period has ended, we’ll eventually ship Raspberry Pi boards with the new network bootloader installed directly from the factory and this step won’t be necessary anymore. Updating the bootloader will be necessary for existing boards already in circulation.
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If you want to try out the network installer you’ll first have to install a beta version of the bootloader. The Raspberry Pi Imager application, which will run in memory on your Raspberry Pi, can then be used to flash the operating system onto a blank SD Card or USB disk, just like normal. The new Network Install feature can be used to start the Raspberry Pi Imager application directly on a Raspberry Pi 4, or a Raspberry Pi 400, by downloading it from the internet using an Ethernet cable. There is now a beta version of the Raspberry Pi bootloader that implements network installation, and we’d like your help to test it. It’s the classic chicken and egg problem, and we’ve just solved it. But how do you get the operating system onto an SD card if you don’t have another computer in the first place? Until today you’ve always needed to use another computer to run Raspberry Pi Imager, or to run something similar, to let you flash your operating system onto an SD card when you get a new Raspberry Pi.