Downgrading firmware question

I have an OnHub router currently running 23.05.3 firmware. Another user has shared with me a pre-built 23.05.2 firmware image with NSS support. If I flash the pre-built firmware will the updated packages from 23.05.3 still work? Do the packages from 23.05.3 require that firmware to operate? Kernel different? I've never tried a downgrade before.

You need a repo for kmods and all base packages from that 3rd party.

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If you flash a different firmware, your device will have the packages contained in the new firmware.

If your friend made the firmware from the Firmware Selector, you can install official software from the repository as normal.