Can't change wlan passphrase

1

I want to change my CPE WLAN Passphrase.

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image1351×374 32.2 KB

but i got error like this

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image700×420 5.9 KB

I can still change other parameters without any problem, for example like WLAN SSID.
my CPE is Totolink N200RE

2

from a forum search:

3

It works… thank you for your reply.