The beta RPiROM – available from thedownloads page – provides the latest betaROM image (a file ‘riscos/img’) for the Raspberry Pi.

This software is suitable for models of Raspberry Pi up to and including the Pi 4B and Pi 400.
The Raspberry Pi 5 isnot supported.

Please note that the betaROM isuntested,work-in-progress software. Some components may be unfinished and/or contain serious bugs: that is what development is about! You should only use the betaROM if you are willing to accept the risks involved and have a suitable backup strategy in place.

If you are new toRISC OS you may prefer todownload one of the “stable release” images instead (e.g.the RISC OS Pi SD image, which contains all the necessary elements ready to be copied to a blank SD card).

Installing the betaROM

TheROM image can be used as a direct replacement for your existingRISC OSROM image.

You should also download the “Nightly Beta HardDisc4” image from theMiscellaneous downloads page, as that contains the latest development version of !Boot.

If you are upgrading from an older release ofRISC OS, you will also have to replace the firmware files. Instructions on how to obtain updated firmware can be found atSoftware information: Raspberry Pi: Firmware.

Full step-by-step instructions for upgrading from an older release ofRISC OS can be foundhere.

Further information

For more on bootloader files (including config.txt and cmdline.txt) seeSoftware information: Raspberry Pi: Firmware.

You may also wish to readUsing RISC OS on the Raspberry Pi.

An explanation of how theRaspberry Pi port works is also available.