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Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, a review; have you tried pressing the OFF button first on the handset before performing the MENU # 3 0 2 ▲/▼ Yes -► [SELECT]
Can you please check?
On the handset, between the TALK and OFF buttons would be the squarish big button where the ▲ and ▼ are on the top portion and bottom portion of this button respectively.
Sorry but my participation is strictly limited to technical, repair and/or installation issues.
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A colleague has provided an image of the handset. Please click HERE. Of interest would be the "B" bottom left of the image.