Peugeot Partner 2016 Microphone issue

[salvodipa]

Hi everyone, I finally managed to change the VIN using Diagbox 7.40 once I swapped the Radio on my VanPeugeot Partner, Stereo Rd45 to Smeg +Iv2
The previous Radio did not have Bluetooth
I have a couple of questions, can you help me please?

1) Microphone
I found the microphone connector next to the courtesy light, so I bought a Peugeot microphone and plugged it in, but it doesn’t work.

Does anyone know the wiring path for the microphone cable?
Is it supposed to run all the way back to the stereo?
Does anyone have a wiring diagram?
Is the microphone supposed to communicate over CAN, or should the MIC+ / MIC− wires connect directly to the SMEG+ IV2?

2) Firmware downgrade
Is there a way to downgrade the firmware from 6.3 to 6.1, even using this guide?

[mickthemaverick]

I have moved this post to this forum as you have a better chance of help here

[shtu]

Does anyone know the wiring path for the microphone cable?
Is it supposed to run all the way back to the stereo?
Does anyone have a wiring diagram?
Is the microphone supposed to communicate over CAN, or should the MIC+ / MIC− wires connect directly to the SMEG+ IV2?

No CANBUS or anything, it's a microphone.

RD45 Head Unit
Fakra B Pin 3 - Microphone Ground - Wire ID 8488
Fakra B Pin 9 - Microphone +ve - Wire ID 8487

SMEG Head Unit
Appears to be the same
https://fccid.io/m/29d4b841dff74bb8456a ... cd0268.pdf
Page 29 of 64 has the pinouts

I would start by checking to see if the microphone wires run directly to the FAKRA connector. If they don't, save yourself a load of headache and just run new wires yourself.

On a Berlingo I thought I would use the existing wiring for the microphone when retrofitting an RD45, gave up trying to find where it actually went to, and made a new loom. If you do run new wire, twist the wires together like the original.