downgrade firmware?

Hi does anyone know how to downgrade the firmware on the PTP650? In the manual it just says it's not easy to downgrade but it doesn't mention any way of doing it. Thanks.

The safe way to downgrade firmware on a PTP 650 ODU is to re-start the ODU in Recovery Mode. Then you need to erase all the configuration. Next, you need to use Recovery to install the downgraded firmware. Finally, you need to re-start the ODU in the (downgraded) application firmware to re-configure it.

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