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Adapter to edit ACM with Forscan (Screaming treble)

Le_Cee
Le_Cee
in Ford Fiesta Club

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Hello,

I have the Ford Fiesta with the Sony radio car and the original Sony speakers. The problem is that I find the treble of my speakers very strong

I would like to change the MCA of my car via Forscan to get less loud treble of my speakers.

I bought a VINT-TT55502 Bbfly adapter and an ELM 327 adapter. Unfortunately, I can not change the ACM values on either. I can connect to the Forscan interface but I can not change the values of the ACM. A window tells me that my adaptater is not compatible with this option.

So, I come to you to know if it is the ACM of my car that is not modifiable or if it is an adapter problem. If it's just an adapter problem, which one will you advise me?

Thank you in advance.

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