i need help to wifi to my other devices then imac
Redo the setup of the TC.
Use SMB names for everything.. ie short, no spaces, pure alphanumeric.
Set a different name for 5ghz.
Set radio channels manually.. use 1, 6, 11 in turn for 2.4ghz as the only non-overlapping channels.
Use WPA2 Personal security only with a 8-12 character.. (more if you are paranoid) password with pure alphanumeric characters.
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