@jordy1690
What graphics mod did you install?

@Koala77
Nice .

Nah, you need to know absolutely nothing about gaming to get a job at Rockstar helpdesk

@hayden9262go
Have a read of this tutorial. Make sure there's nothing wrong inside 'dlclist.xml'.

Also, make sure you have a custom gameconfig installed. Try this one or this one. Also install any prerequisites in the Description tab (heapadjuster/packlimit adjuster etc) if you haven't already.

@Koala77
Haven't installed it yet, but noticed no 'carvariations.meta' lines in 'content.xml', so that's probably it.
Try this 'content.xml' & let me know

@gtavjamal

What issues are you having with the tail lights exactly? (any pics etc?). For me, rear tail lights are a bit dim, but other than that, they work (headlights certainly work normally).

Try these vehicle files & this carcols & see if that is any better (tail lights should appear somewhat brighter & headlights should appear & shine on environment brighter (see below pic)):

@Koala77
Try this:

carvariations.meta:

<?xml version="1.0" encoding="UTF-8"?>

<CVehicleModelInfoVariation>
  <variationData> 
    <Item>
      <modelName>bmwbri2</modelName>
      <colors>
        <Item>
          <indices content="char_array">
            2
            1
            156
            27
            0
            27
          </indices>
          <liveries>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
          </liveries>
        </Item>
        <Item>
          <indices content="char_array">
            4
            0
            111
            156
            0
            0
          </indices>
          <liveries>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
          </liveries>
        </Item>
        <Item>
          <indices content="char_array">
            28
            89
            0
            156
            0
            0
          </indices>
          <liveries>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
            <Item value="false"/>
          </liveries>
        </Item>
      </colors>
      <kits>
        <Item>0_default_modkit</Item>
      </kits>
      <windowsWithExposedEdges />
      <plateProbabilities>
        <Probabilities />
      </plateProbabilities>
      <lightSettings value="9882" />
      <sirenSettings value="0" />
    </Item>
  </variationData>
</CVehicleModelInfoVariation>

If that doesn't work, is it this '2018 Unmarked BMW M5 F90 [Replace | ELS] V1' that you've converted to an add-on yourself? If so, upload the 'dlc.rpf' somewhere & I'll take a look at it. If not supply a download link to the add-on.

@JohnFromGWN
I'm not sure why just some peds. Could be they are just broken in some way, but yeah, it's total weird being able to solve it by throwing random numbers at it. When does that ever usually work out?!

@JohnFromGWN
It reminds me of ModKitID conflicts. No-one fully understands that system, even now. Sure, they can usually be fixed by trial & error, but the game be doing some funky stuff behind the scenes, moving stuff around & making fully understanding the issue almost impossible.

There's also passive aggressive sabotage to take into account as well. Apparently Rockstar is a pretty toxic environment to work in. No-one there is doing their best work. Stuff like this going on:

Sounds like a cliquey place to me, just a few bigwigs that think they know better than everyone else. More interested in subordination than creating a sublimely engineered game or being interested in new ideas.

Money rots at things too, not likely to get better in future considering how much money Rockstar now make:

How much money GTA V Online generates:

Year = £663,877,585 (~£664 Million)
Month = £55,323,132 (~£55 Million)
Day = £1,818,842 (~£1.8 Million)
Hour = £75,785
Minute = £1263
Second = £21.50

For the '<Unknown54 value="0" />' issue, most likely the value used was considered 'out of bounds' etc. Either codewalker edited it as you imported it (most likely), or the game edited it when it loaded it. I've seen that happen before in '.ymap's & '.rel' files (if you import '.rel' files without an accurate nametable file for example, english values are converted to hex etc).

@JohnFromGWN
Yeah, just play with the values, see if you can figure out what fixes it etc. If it's anything like vehicle ModKitID conflicts tho, the process used by the game will resist being completely understood, but if you can change the outcome in a reliable way, you potentially have a path to a solution/understanding how it works.

@JohnFromGWN
Maybe try renaming all pack name lines to unique names too if you continue to have conflicts (mai2, mai3, mai4... etc. Just no duplicate names anywhere). Not sure it does anything, but that's what I've done & hasn't caused any issues so far in my game.
I only have like ~3x Mai models installed as different replaces & a few other peds too, but never seen any conflicts before testing startgirl/gwoman.