I’ve noticed that my RUT240 is running a bit slow with high memory and cpu usage on the latest firmwares (7.06.x) so I am trying to downgrade to the stable legacy version to try and squeeze some performance out of it.
When I upgrade via the webui it appears to work but then restarts and has the original firmware version.
When I perform the upgrade via ssh I get the error:
root@RUT240:/tmp# sysupgrade -F RUT2XX_R_00.01.14.7_WEBUI.bin
Sun Feb 15 21:44:59 UTC 2026 upgrade: Image signature not present
Sun Feb 15 21:45:02 UTC 2026 upgrade: Image metadata not present
Sun Feb 15 21:45:04 UTC 2026 upgrade: Firmware metadata not found
Sun Feb 15 21:45:08 UTC 2026 upgrade: Detected firmware downgrade
Sun Feb 15 21:45:08 UTC 2026 upgrade: Cannot restore config due to firmware incompatibility
Sun Feb 15 21:45:10 UTC 2026 upgrade: Commencing upgrade. Closing all shell sessions.
Connection to 192.168.1.1 closed by remote host.
Connection to 192.168.1.1 closed.
How can I downgrade to the legacy firmware?