Mono Gateway images

OPNsense install image for the Mono Gateway, compressed (.img.bz2), with checksums.

Unofficial community build. Not made or supported by Mono.

Already running OPNsense? Save your config first. Flashing erases everything on the router, including your settings. In the OPNsense dashboard go to System › Configuration › Backups and click Download configuration. After flashing, restore it from the same page.

Using the mono-imager? Use mono-imager v1.4.0 or newer and give it this .img.bz2 file: in LAN mode, its path on your computer; in USB mode, copy it to the stick. The install guide below covers the manual method.
Download the latest mono-imager · install instructions

OPNsense-202610081133-arm-aarch64-GATEWAY.img.bz2

Built 2026-10-08 · 618 MB · OPNsense 26.7 for the Mono Gateway

Download image SHA-256 file MD5 file

SHA-256: f81030c95147eaa989dab4a179c439696cd914536d207c6892c7c2bd4af9691d
MD5: c59266bb9161a1f52183e542099c8406

Permanent link to the newest image (for guides and posts): https://mono-opnsense.sincevic20.com/images/latest

Check the download

The result should match the SHA-256 above.

macOS:

shasum -a 256 OPNsense-202610081133-arm-aarch64-GATEWAY.img.bz2

Windows (Command Prompt):

certutil -hashfile OPNsense-202610081133-arm-aarch64-GATEWAY.img.bz2 SHA256

Linux:

sha256sum OPNsense-202610081133-arm-aarch64-GATEWAY.img.bz2

Install

Keep the file compressed: the Mono imager expects the .img.bz2 file as it is.

Open the install guide

Step-by-step flashing and first setup.