DONE ! I achieved this through blood, sweat, tears, and sheer determination

Here sharing final stages with thanks to Chatgpt..

CLEAR AND DEFINITIVE SOLUTION (IN ORDER OF IMPORTANCE)

PLACE THE ECU DEFINITION FILE IN THE CORRECT LOCATION
omRaider cannot find this file:
C:\Program Files\Romraider\ecu_defs.xml
What you need to do (the cleanest way):
Place the ecu_defs.xml file here:
C:\RomRaider\ecu_defs.xml
Open RomRaider as Admin
Settings → ECU Definitions
Manually set the path to:
C:\RomRaider\ecu_defs.xml
OK → Close RomRaider → Open it again

Nothing will be fixed without this step.

100% SOLUTION – CLEAR IMPLEMENTATION SEQUENCE

CLOSE RomRaider
It must be completely closed.

MANUALLY EDITING SETTINGS.XML (THE MOST IMPORTANT STEP)
File:
C:\Users\SALCI\.RomRaider\settings.xml
Open this with Notepad++ / Notepad.

FIND THE FOLLOWING BLOCK
You will see something similar to this (names may be slightly different):
<logger>
<connectionType>serial</connectionType>
<serialPort></serialPort>
<baudRate>4800</baudRate>
</logger>

CONVERT TO THIS (EXACTLY):
<logger>
<connectionType>j2534</connectionType>
<j2534Device>OpenPort 2.0</j2534Device>
<autoDetect>false</autoDetect>
</logger>

Delete all lines containing serial, com, baud, and port.
Save → Exit.

100% WORKING FIX (EXACTLY AS SHOWN)

RomRaider must be OFF

COMPLETELY CHANGE THIS BLOCK in settings.xml

DELETE THE FOLLOWING (entirely):
<serial port="" refresh="false"/>
<protocol name="SSM" transport="ISO9141" module="ECU" fastpoll="true" library=""/>

REPLACE IT WITH THE FOLLOWING:
<j2534 device="OpenPort 2.0"/>
<protocol name="SSM" transport="J2534" module="ECU" fastpoll="true" library=""/>

Make sure all characters, spaces, and capitalization are the same.

BLOCK FINAL STATUS (EXAMPLE)
Your <logger> block should look like this:
<logger locale="en_US">
<autoConnectOnStartup value="false"/>
<j2534 device="OpenPort 2.0"/>
<protocol name="SSM" transport="J2534" module="ECU" fastpoll="true" library=""/>
<maximized value="false"/>
<size x="645" y="1000" divider="400"/>
<location x="101" y="44"/>
<tabs selected="2" showlist="true"/>
<definition path="C:\RomRaider\logger_METRIC_EN_v370.xml"/>
<profile path="C:\Users\SALCI\Desktop\ss.xml"/>
<filelogging path="C:\Users\SALCI\Desktop" switchid="S20" active="false" absolutetimestamp="true"/>
<debug level="debug"/>
<plugins>
<plugin id="com.romraider.logger.external.phidget.interfacekit.plugin.IntfKitDataSource" port="HID USB"/>
</plugins>
</logger>

SAVE → EXIT → OPEN ROMRAIDER AS ADMIN

FINAL CHECK (1 FILE, 1 LINE)
Make sure the following is present in C:\RomRaider\customize\j2534Libraries.properties:
OpenPort 2.0=op20pt32.dll

100% SOLUTION – FIX THIS FILE (1 MINUTE)

OPEN the file
C:\RomRaider\customize\j2534Libraries.properties
Open with Notepad / Notepad++.

CHANGE THE LINE windows= EXACTLY

Existing:
windows=

CHANGE TO:
windows=op20pt32.dll

That's all
I don't want you to write the path or change the name.

DLL CHECK (VERY IMPORTANT)
This file must be here:
C:\RomRaider\lib\windows\op20pt32.dll
If it's not there:
Copy it from C:\Program Files (x86)\EcuFlash\
Copy it to RomRaider (don't move it)
Now, the only thing left is:
To see in the log that RomRaider actually entered the J2534 path.

FINAL CHECKS (1 MINUTE)

CONFIRM DLL LOCATION (IMPORTANT)
Is this file definitely here? (I want you to check manually)
C:\RomRaider\lib\windows\op20pt32.dll
If it's not here, it won't work.
Note: If it's in Program Files (x86)\EcuFlash\
→ copy and paste into RomRaider

FINAL AND CLEAR STEPS

j2534Libraries.properties (FINAL VERSION)
The file should be located exactly here:
C:\RomRaider\customize\j2534Libraries.properties
Its content should be exactly like this (no spaces, leave a comment, it doesn't matter):
windows=op20pt32.dll
linux=j2534.so ; /usr/local/lib/j2534.so ; j2534.dylib ; /usr/local/lib/j2534.dylib
Save → Close.

RESETTING THE OLD SERIAL SETTING (VERY IMPORTANT)
RomRaider keeps asking for the serial because the old setting is still there.

Go to:
C:\Users\SALCI\.RomRaider\
Do not delete the contents, only:
settings.xml
delete or rename the file:
settings.xml.bak
RomRaider will rebuild with clean J2534 settings when it starts.
SM-G998B cihazımdan Tapatalk kullanılarak gönderildi