So you have an ADSL and PO router model Zyxel-AMG1302-T10A.
I had a PO Zyxel-AMG1302-T10B. The PO broadband was rubish and they let me leave early. The router worked very well with a Plusnet ADSL.
To get the PO BB userid and password, I saved the router's romfile.cfg and then edited it with Notepad++
If you do that, you might then be able to use just the HH5. No harm in trying.
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Michael Chare