GM E86 LML Flash Workspace - Combine & Split ECM Flash Files Tool

GM E86 LML Flash Workspace - Combine & Split ECM Flash Files Tool

LML Flash Workspace is a portable Windows utility for offline processing of GM E86 LML ECM memory files.

The tool combines separate Internal Flash, External Flash and EEPROM reads into one standardized binary image and can split the combined image back into three files for programmer use.

All processing is performed locally on the computer. The application does not connect to the vehicle or ECM, does not program the ECU and does not perform checksum correction.

GM E86 LML Flash Workspace Combine mode for merging 2 MiB Internal Flash, 2 MiB External Flash and 128 KiB EEPROM into one ECM image.

Key Features

GM E86 LML ECM file workspace
Completely offline operation
Combine Internal Flash + External Flash + EEPROM
Split combined image back into programmer files
Strict input file-size validation
Original source files are opened read-only
Existing output files are not silently overwritten
Integrated combined-format map
Operation log
Portable Windows application
No vehicle or ECM connection required

Exact File Sizes

The workspace expects exact memory-read sizes:

Code:

Internal Flash : 2,097,152 bytes - 2 MiB
External Flash : 2,097,152 bytes - 2 MiB
EEPROM         :   131,072 bytes - 128 KiB
Combined Image : 3,276,800 bytes - 3.125 MiB

Renaming a file does not make an incorrect read compatible. If the size is wrong, obtain the correct read using the appropriate programmer mode.

Combined Image Format

The 3.125 MiB combined image uses the following layout:

Code:

INTERNAL : 0x000000 - 0x1FFFFF   2 MiB
EXTERNAL : 0x200000 - 0x2FFFFF   1 MiB
EEPROM   : 0x300000 - 0x31FFFF   128 KiB

Only the first 1 MiB of the 2 MiB External Flash is stored inside the combined format.

The second 1 MiB of External Flash is not present in the combined image.

Combine Flash Files

The Combine workflow creates one 3.125 MiB image from three separate ECM reads:

Select the 2 MiB Internal Flash
Select the 2 MiB External Flash
Select the 128 KiB EEPROM
Choose a new output file
Select COMBINE & SAVE

The original files remain unchanged.

The resulting combined binary has the exact size:

Code:

3,276,800 bytes
0x320000

Split Combined File

The Split workflow converts a valid 3.125 MiB combined image back into three programmer files.

For an input named:

Code:

Example.bin

the workspace creates:

Code:

Example_IntFlash.bin - 2 MiB
Example_ExtFlash.bin - 2 MiB
Example_EEPROM.bin   - 128 KiB

Important External Flash behavior:

The first 1 MiB of the restored External Flash comes directly from the combined image.

The second 1 MiB is filled with:

Code:

FF

This is intentional because the second half of the original External Flash is not stored inside the combined 3.125 MiB format and therefore cannot be reconstructed from it.

Offline & Portable

LML Flash Workspace is a local file-processing tool.

It does not:

Connect to the vehicle
Connect directly to the ECM
Read memory from the ECM
Write or flash the ECM
Correct checksums
Require registration or user login

Read and write operations must be performed separately with the appropriate professional programmer.

System Requirements

Windows 10 or Windows 11
Microsoft .NET Framework 4.8
Normal Windows user account
Writable local folder for output files

The application is portable and can be launched directly from a normal accessible folder.

Package Contents

The current package contains:

Code:

LML_Flash_2.0.0.exe

No additional installation package is required.

File Integrity

File: LML_Flash_2.0.0.exe

Version: 2.0.0

SHA-256:

Code:

3e9f22fea3fe2c1eb909e3144205942c256e16a4eec2b17a2739ba676150f860

VirusTotal:
View VirusTotal report

The VirusTotal report above corresponds to the executable identified by the exact SHA-256 hash shown above.

Important

Always preserve untouched backups of the original ECM reads.

Before combining files, verify that Internal Flash, External Flash and EEPROM all belong to the same ECM.

A successful Combine or Split operation confirms the file-format transformation only. It does not confirm that the resulting file is suitable for programming.

Verify all output names and exact file sizes before using them with a programmer.

GM E86 LML Flash Workspace Split mode for extracting Internal Flash, External Flash and EEPROM files from a 3.125 MiB combined ECM image.

GM E86 LML Flash Workspace - Combine & Split ECM Flash Files Tool 2.0.0