Hello everyone, here I am again with one retrofit which partially did.

I have idea of installing footwell, optic ambient tubes in door trims and dashboard trims.

For now only footwell is installed.

Initially I wanted to fully complete and then write but I got stuck at one problem so I need HELP.

1. I bought cheapest set of four footwell lights which support LIN for around 35€ at AliExpress,

2. And because my BCM doesn't have C29 pin (which you must have for LIN communication) I also bought LIN decoder for around 30€.

Wiring is pretty simple and well explained on available tutorials over internet.

1. You basically connecting + from footwell to SC8 7,5A fuse, ground to grounding point and LIN to C29 on BCM.

2. But if you don't have C29 pin on BCM then you need to buy decoder (or replace BCM) which + also going to SC8 7,5A fuse, ground to grounding point, and LIN output to LIN input on the footwell.

3. Next step is coding, which I did with ODIS (VCDS also fine), you can follow up any of tutorials, there is at least 3-4.

   This is how it looks: https://www.youtube.com/watch?v=U86_TLvWndg

   PROBLEM:

   My swing MMI doesn't support color themes for itself. I can change color and intensity of footwell light but light on swing doesn't change.

   I believe problem is in obsolete and buggy firmware MEN2_EU_SKGPx_P7021L with MU 8190, which I can't update to only available firmware which is MEN2_EU_SKGPx_P0080L with MU 8755 because I always get error like a, signature source couldn't be verified.

   Here you can see that under Engineering menu>HMI Look and Feel>Runtime color switch you can change manually color.

   https://www.drive2.ru/l/543886347014766736/

   My unit doesn't have that option at all.

   

   I searched whole internet on different languages and cannot find solution how to update firmware to MU 8755 or at least any other firmware.

I will be very thankful for anyone who can send me any firmware which could work for my unit, or point me how to disable signature check or avoid it with some other way.

Which Coding BCM you have done?

There is a lot to say about coding, i personally used this resources:

VAG Coding

Octavia 3 (5E) Facelift - Ambient Light Activation (color...

Purpose: to activate the Ambient Light option on your MIB for changing screen and Virtual Cockpit colors (depending on your MIB version, you may not be able to activate all 30 colors, but only 10). Co

Кодирование автомобилей VAG - Кодирование зон освещения

Основные кодировки и адаптации платформ концерна VAG. Прошивки и параметрии. SWaP коды

https://vwcoding-ru.translate.goog/MQB/esteticLightsCodingRGB/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=ajax,nv,elem,se

https://www.glaskugelservice.de/codierung/ambientbeleuchtung

https://www.drive2.ru/l/663326844895891900/

https://www.drive2.ru/l/663230912506365858/

Also did my resarch which is in attachment.

adpmap-09-5Q0-937-084-CD_TMBAM7NE3J0057395-20251006-1722.xlsx

This is a good Manual:

https://glaskugelservice.de/codierung/ambientbeleuchtung

But you need Ambient Basic Coding for this m an Manual

I will Backup my Car for you

On 13/03/2026 at 20:30, Cairus said:

This is a good Manual:

https://glaskugelservice.de/codierung/ambientbeleuchtung

But you need Ambient Basic Coding for this m an Manual

I will Backup my Car for you

@Cairus What coding do I need? Please send me.

Wait

1.4 KB file on MEGA

https://mega.nz/file/kmFACZSJ#kDQ3gS7UcSF0gPvZfntqYAkwnpXontx0d_mnLhVx9V4

218.4 KB file on MEGA

WA

On 17/03/2026 at 18:15, Zlatko580 said:

@Cairus What coding do I need? Please send me.

News?

Hi, thank you for admap, i started to analyze differences between my and your, but didn't find enough time in past couple days. I will update thread when analyze and test.

Also do you have color instrument cluster, and do you have SWING or something else?

Virtual Cockpit mib 2 "Low" Navi

Backup is Seat Leon 5F Facelift

Edited 19 March19 Mar by Cairus

Well, your admap is more/less same as mine, except you have BCM HIGH so you have wider color pallet.

Anyway adaptation channels not have any option releated to MMI, there is options for configuring different ambient light equipment such as VC, door strips, speakers, central console, dashboard etc.

I believe MMI is automatically on when you activate Ambient lights menu and color palette.

Is your train version MEN2_EU_SEGPx_7021L and MU version 8190 or newer?

You need BCM High for colour Light

I already have color light, as you can see here: https://www.youtube.com/watch?v=U86_TLvWndg

I'm surprised how little information's are known for this type of MMI, as I think there is plenty of them on the market.

Is it possible that no one have any idea about this questions?

1. Link to any firmware which could work with train MEN2_EU_SKGPx_P7021L MU: 8190, HW: 612?

2. How to disable signature check on firmware update?

3. Or any other way how to update firmware on this unit?

Edited 19 March19 Mar by Zlatko580

Sorry, i understand it wrong.

Swing dont Support this

Check this in 5F under adjustment --->

Car_Function_Adaptations_Gen2

menu_display_ambient_illumination

aktiviert

menu_display_ambient_illumination_clamp_15_off

nicht aktiviert

menu_display_ambient_illumination_over_threshold_high aktiviert

menu_display_ambient_illumination_standstill nicht aktiviert

menu_display_ambient_illumination_after_disclaimer

nicht aktiviert

11 minutes ago, Cairus said:

Sorry, i understand it wrong.

Swing dont Support this

Well how this guy did it then? https://www.youtube.com/watch?v=mNUeu3GJDOI

Also here...

https://www.drive2.ru/l/543886347014766736/

9 minutes ago, Cairus said:

Check this in 5F under adjustment --->

Car_Function_Adaptations_Gen2

menu_display_ambient_illumination

aktiviert

menu_display_ambient_illumination_clamp_15_off

nicht aktiviert

menu_display_ambient_illumination_over_threshold_high aktiviert

menu_display_ambient_illumination_standstill nicht aktiviert

menu_display_ambient_illumination_after_disclaimer

nicht aktiviert

It is all set exactly.

adpmap-5F-5E0-035-871-C_TMBAM7NE3J0057395-20250920-1224.CSV

Edited 19 March19 Mar by Zlatko580

Have you unlocked the developer menu? There you find this Option. The color remains fixed and doesn't change.

Edited 19 March19 Mar by Cairus

Yes I am, but I don't have option to change color under HMI Look and Feel, as you can see in first post.

Backup say No Activ Developer Mode?

You have To Open Service Menü

Edited 19 March19 Mar by Cairus

That backup was before I activated developer menu.