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Stihl Diagnostic Software 20 Fixed ((exclusive)) [FREE]

REPORT: Analysis of STIHL Diagnostic Software Version 2.0 (Fixed Release)

Date: October 26, 2023 Subject: Operational Overview and Feature Analysis of STIHL Diagnostic Software v2.0 Status: Released / Fixed Version

2. Power Supply to the MDG 1

The STIHL MDG 1 device draws power via USB. If you are using a laptop on battery saver mode, a low-quality USB hub, or a very long USB extension cable, the voltage drop triggers Error 20. The device fails to initialize its internal processor. stihl diagnostic software 20 fixed

1. The Dealer Lock (Authentification Error)

The official STIHL Diagnostic Software 2.0 requires a paid, active dealer subscription. When you install the software without a valid dealer login or an activated dongle, you receive errors like “No Interface Found,” “License Expired,” or “Authentification Failed.” A “fixed” version claims to bypass this dealer lock.

Step 4: The "Dolfin.ini" Fix (Advanced)

For older software builds (pre-2023), you must manually edit the configuration file to resolve Error 20 permanently. REPORT: Analysis of STIHL Diagnostic Software Version 2

  1. Navigate to C:\Program Files (x86)\STIHL\Dolfin\
  2. Open Dolfin.ini with Notepad as Administrator.
  3. Find the line: ForceConnectionType=0. Change it to ForceConnectionType=1.
  4. Add this line underneath: ComPortOverride=3 (matching your COM port from Step 3).
  5. Save and restart the software.

5. Best Practices for Workflow

To ensure consistent diagnostic results, the following workflow is recommended:

  1. Pre-Scan: Connect the interface to the machine before turning the ignition on. Allow the software to auto-detect the protocol (K-Line or CAN-Bus).
  2. Code Retrieval: Record all "Current" codes.
  3. Repair: Perform necessary mechanical or electrical repairs.
  4. Verification: Turn ignition on; observe the software. The codes should toggle from "Current" to "Fixed" (or "Sporadic").
  5. Clear Memory: Select "Clear Fault Memory." This resets the check engine light/Malfunction Indicator Lamp (MIL).
  6. Post-Scan: Perform a final scan to confirm zero stored codes.

The Major Fixes in Version 2.0

1. Plug-and-Play USB Stability (Finally) Older versions required you to dance the "driver tango"—installing, uninstalling, rebooting, praying. Version 2.0 uses native USB-C communication protocols. You plug in the MDG 1 (or the new MDG 2 interface), and the PC recognizes it instantly. the following workflow is recommended:

2. M-Tronic 3.0 Calibration The latest saws have auto-calibrating carbs, but the software used to glitch when resetting the throttle stop values. The "Fixed" 2.0 version handles the new solenoid logic perfectly. No more "Solenoid Short" false alarms.

3. No more "Bricked" ECUs The scariest part of tuning a modern saw is the firmware update. If the power flickered in V1.0, you had a $300 paperweight. V2.0 introduced a checksum validation and a recovery mode. If the flash fails, the software can now roll back to the previous safe state.

Step 5: Firmware Update for the MDG 1 Device

If Error 20 persists, your diagnostic tool itself is bricked via firmware mismatch.

  • Open the STIHL Diagnostic Software.
  • Go to "Settings" > "Update Interface."
  • Note: This process requires a stable internet connection. If the interface cannot be updated due to Error 20, you must use a secondary PC with an older OS (Windows 7) to flash the MDG 1 back to factory spec.