Zoom currently supports setting firmware and Zoom Phone client application software rules via the admin settings in the Zoom Web Portal. If a downgrade is necessary, this is the best option to try first since previous application and firmware versions may be available to use. The software rules will downgrade the device if a previous/lower version is selected. Account owners and admins can also submit a request to Zoom Support to downgrade their Zoom Phone Appliance client application and/or the manufacturer's firmware version without using software rules. If Zoom Support identifies a possible problem that can be resolved by downgrading the software, admins will be able to access this option in the Zoom Web portal. This feature enables the downgrading of software on a single device or multiple devices at once. Once Zoom Engineering has loaded the available software versions into the system, you can follow these instructions.