The manufacturer expects the new firmware to be ready early this week and plans to send customers with information about 5.21 Patch 1 via the MyZyxel newsletter.Ĭustomers who have enabled features such as "Auto Reboot" / "Schedule Reboot" are strongly recommended by the manufacturer to disable this feature until the firmware 5.21 Patch 1 is ready and can be updated. Zyxel is working on a firmware update for all customers who have not yet rebooted the device. So as long as the firewall is not rebooted, it should continue to work. The device is in on-premise or Nebula on-cloud modeīecause the problem of the hanging firmware only occurs after the reboot.The device is using an IDP or App Patrol license.The device has an active UTM/security license.However, the following conditions must be met for the error to occur: The firewall firmware hangs during startup and cannot stop the SYS LED from flashing. An affected device fails to boot up successfully. Affected: Firewall ATP and USG FLEX seriesįirewall devices in the ATP series and USG FLEX series are affected. In it, Zyxel confirms that it is aware of an unexpected behavior that causes some of the company's firewall products to fail to boot up successfully under certain conditions. From Zyxel there is a support article USG FLEX / ATP Series – Device Reboot cause my device can´t boot up successfully (Sys blinking) – Recover SOP! from March 14, 2022. Blog reader Mario pointed out the device reboot issue on Zyxel USG FLEX / ATP Series firewalls with the latest firmware in this comment (thanks for that).
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