ZyWALL 110 Firmware Upgrades (4.20 - 4.73)

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We have temporarily added a second location so I need to pull one of our old Zywall 110 units out of retirement. I want to update it from 4.20 to the latest 4.73 firmware. Unfortunately, when I log into the portal, it only offers 4.73. I checked the FTP server and cannot find a Zywall 110 folder. I'm sure there is a specific path of updates to get to the latest version.

Is there an old firmware archive somewhere so another way to obtain these previous firmwares?

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