ZyXEL 1910-24 password pitfall

Just swapped my old lab switch, a LevelOne GSW-1676, for a ZyXEL GS1910-24. Really nice piece of hardware, fanless, snappy GUI, good VLAN management, lots of features, including IPv6 support. And cheap, so basically I’m very satisfied.
Until I changed the default admin password. Of course a long phrase with some special characters. Including a colon, which the GUI let me do without any complaint. But this locked me out of the switch.
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