Zyxel is warning that a bad security signature update is causing critical errors for USG FLEX or ATP Series firewalls, including putting the device into a boot loop. [...]
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source https://www.bleepingcomputer.com/news/security/zyxel-warns-of-bad-signature-update-causing-firewall-boot-loops/
source https://www.bleepingcomputer.com/news/security/zyxel-warns-of-bad-signature-update-causing-firewall-boot-loops/