Great work guys!! I will have to examine the dump files but I'm really interested to see if it's possible to change the GM "bong" chimes to something else... I'm assuming that this is stored on the HMI unit right? It would be fun to be able to inject my own chimes and personalize the car a bit. I'm curious if anyone has tried this yet.

@Troy Can you please share a mega link with the HMI 2.5 dump that contains the linux OS? I want to see if my software mods are possible first before I tear apart my dash or spend any money on this project. Thank you!

2 minutes ago, Nicholas Trambitas said:

@Troy Can you please share a mega link with the HMI 2.5 dump that contains the linux OS? I want to see if my software mods are possible first before I tear apart my dash or spend any money on this project. Thank you!

Hi I will try to dump EMMC from a working HMI 2.5 when I get some free time.

9 minutes ago, Troy said:

Hi I will try to dump EMMC from a working HMI 2.5 when I get some free time.

Thanks, I appreciate it!!

that would be cool to edit the chime. is there any other mods that can be done on Gm

On 7/1/2025 at 8:44 PM, Asinine said:

that would be cool to edit the chime. is there any other mods that can be done on Gm

If I have a dump, I can see what else can be coded in... I'm going to assume that since the HMI 2.5 has both a bluetooth and wifi chip, maybe it's possible to somehow port over wireless carplay. Would be cool to look into

For anyone who is Interesed in chance chime. I think it is not posible because it is on the silverbox to make noice at startup even whene the system is not up.

@Arbe_gtc 

On 9/11/2024 at 9:33 PM, Arbe_gtc said:

Solved.

 

I have a CONSOLE in HMI:

 

And SSH access wia WIFI

 

 

Winter is cooming 🤣

 

 

THANKS @HMI_Guy

How did you get from no consol to the consol? I tryed the reset methote without luck. Did i need to connet the Silverbox and Display? or is there a secred?

2 hours ago, marceltestboy said:

@Arbe_gtc 

How did you get from no consol to the consol? I tryed the reset methote without luck. Did i need to connet the Silverbox and Display? or is there a secred?

Upgrade the HMI to the last firmware available and works

I have the Pinout From the EMMC. But my Reader does not Reconice the Card. The power draw is arount 500mA is this nomal?

41 minutes ago, marceltestboy said:

I have the Pinout From the EMMC. But my Reader does not Reconice the Card. The power draw is arount 500mA is this nomal?

To read the eMMC chip, you need a very specific reader; not all readers will work. I also had to remove the silver capacitors from the HMI because they were charging with the current from the SD card reader, causing it to stop working and reading the eMMC. With serial access enabled and Wi-Fi/Ethernet access activated, I think eMMC access is pretty much unnecessary.

Can anyone tell me how to enable WIFI? i have acess over UART and the EMMC.

On 2/3/2026 at 1:19 PM, marceltestboy said:

Can anyone tell me how to enable WIFI? i have acess over UART and the EMMC.

to enable the wifi you need change calibrations (the number 8 have the wifi seffings)

Okay i see, can you Tell me what option this is in readeol.out? I found out how to use this tool to write configs. But there is no option for wifi. Maybe onstar? I have disasambel the programm to finde the options strings.

7 hours ago, marceltestboy said:

Okay i see, can you Tell me what option this is in readeol.out? I found out how to use this tool to write configs. But there is no option for wifi. Maybe onstar? I have disasambel the programm to finde the options strings.

It'll actually read back the current calibration config in the HMI. When I buy used HMI's, I do this for fun sometimes, I wrote a script that dumps all of the existing commands. The VIN would get you that in most cases anyways (unless there's an updated calibration) but it's kind of neat.

Is there a way to finde out what calibration file does what at what exakt location? The eolupdatetrigger is nice but there are many mystery reserved values

5 minutes ago, marceltestboy said:

Is there a way to finde out what calibration file does what at what exakt location? The eolupdatetrigger is nice but there are many mystery reserved values

In some cases, you just have to play around. Languages for example, I had to trial and error that one when I was helping someone. The bench setup definitely helps in some cases for this.

Yes i was not able to activate oder deactivate Features. I try onstar but the icon does not Show up. I hat the feeling no metter what i chance with this tool nothing chance. I have found the vin file and by removing the HMI learnd the vin frim my car. :D but it was a long way with ghidra

1 minute ago, marceltestboy said:

Yes i was not able to activate oder deactivate Features. I try onstar but the icon does not Show up. I hat the feeling no metter what i chance with this tool nothing chance. I have found the vin file and by removing the HMI learnd the vin frim my car. :D but it was a long way with ghidra

What are you using to edit? Almost sounds like it's not working. I've turned every icon on, it's kind of fun to see lol.

There is the app called readeol.out. if you create an symbol link with the Name writeeol.out you can write the values that you can normaly read. Writing works as i can read the changes back...

6 minutes ago, marceltestboy said:

There is the app called readeol.out. if you create an symbol link with the Name writeeol.out you can write the values that you can normaly read. Writing works as i can read the changes back...

Interesting, I've never actually tried writing with that, I've only ever pulled values. I'll test it tonight and let you know. I always just use my calibration editor then throw the entire thing up. That would be quicker for sure. If you change the theme then restart, does it work?

No even after a reboot nothing chance but the values are still readable with readeol. How can i Translate the values from the tool to the right calibration file and location? What file i think is writen in eolupdatetrigger. But how to get the right location and recalculate the checksum?

Can you Tell me what has to be aktivatet to enable wifi so i can use ssh? The manuel way over ifconfig in linux is a littel bit long

5 minutes ago, marceltestboy said:

No even after a reboot nothing chance but the values are still readable with readeol. How can i Translate the values from the tool to the right calibration file and location? What file i think is writen in eolupdatetrigger. But how to get the right location and recalculate the checksum?

Can you Tell me what has to be aktivatet to enable wifi so i can use ssh? The manuel way over ifconfig in linux is a littel bit long

you have the answer in the thread (to ssh access)

wifi, you need a cal 8 with the Shop enabled. there are a lo of changes to enable the wifi settings

Good morning everyone,

I was wondering if anyone has experience with the camera application on HMI (IO6 / HMI 2.5).

When the camera application is enabled, a panel appears at the bottom allowing selection between two different guideline styles. However, this layout is different from the reverse camera view. The addition of this bottom panel seems to slightly distort or “squeeze” the camera image compared to when the vehicle is in reverse.

I’ve tried adjusting various RVS definitions in the calibration (track width, overlay parameters, etc.), but these changes do not affect the camera application mode at all — only reverse mode.

Has anyone successfully:

• Removed the bottom guideline selection panel in the camera app?

• Forced the manual camera app to use the exact same guideline profile as reverse?

• Identified whether this behaviour is controlled in a different calibration block or handled at application level?

I’ve attached comparison examples below.

Any guidance would be greatly appreciated.

CAMERA APPLICATION:

REAR VIEW CAMERA:



Bonus question:
Is there any known method to extend the 8 second timeout when using the camera application, or is this hardcoded within the HMI software?

It is for cars with surround or 360 view cameras, there is an additional camera processor required. Have not found a way to bypass the time limit