CAT Flash Files — what they are and why you need them
CAT Flash Files are the official calibration/software packages used to program Caterpillar ECMs. They’re applied with Caterpillar Electronic Technician (CAT ET) via the built-in WinFlash utility and a compatible CAT communication adapter. Typical use cases are ECM replacement, software updates, emissions/feature updates, and restoring correct horsepower/torque ratings on engines and machines.

Which software uses these files?

• CAT ET (Electronic Technician) for Windows — the service application that identifies the product, reads DTCs, and runs Utilities → WinFlash to load the proper Flash File to an ECM.
• WinFlash — the programming module inside CAT ET that erases the ECM flash and loads the selected file.
• SIS / FFS index — Service Information System and Flash File Search are typically used to locate the correct file by serial number, ECM part/test spec, and rating.

What’s included in this 4-DVD 2020 set
Your screenshots show a classic 2020 release split into multi-part archives:

• DVD001 — DVDA9022-20 (RAR parts: DVDA902220.part01…part20)
• DVD002 — DVDA9023-20 (RAR parts: DVDA902320.part01…part18)
• DVD003 — DVDA9024-20 (RAR parts: DVDA902420.part01…part16)
• DVD004 — DVDA9025-20 (RAR parts: DVDA902520.part01…part18)

Each DVD is a dual-layer image split into ~20 pieces (~300 MB each) for easier download/transfer. After extraction you’ll have four ISO folders/discs with the factory Flash Files and index.

Coverage overview
This generation of DVDs covers a wide range of Caterpillar on-highway and off-highway engines and machines. Examples include popular engine families (C7/C9/C13/C15/C18, 3406E, etc.) and machine ECMs used across construction, industrial and power systems. Availability of specific ratings is region/serial-number dependent.

How to pick the RIGHT file

• In SIS (or your catalog), search by machine/engine S/N and open Engine Performance Specifications / Flash Files.
• Match the ECM hardware PN/test spec and the desired rating/emissions family.
• Note the Flash File number and extract the corresponding file from the DVD set.

Typical programming workflow (CAT ET + WinFlash)

• Install CAT ET and your CAT Comm Adapter II/III drivers.
• Extract the four DVDs; mount the needed ISO or point ET to the folder.
• Connect to the product, back up current parameters, then open Utilities → WinFlash.
• Select the target ECM, choose the correct Flash File, and follow the prompts until ET reports success.
• Restore/adjust parameters (FLS/FTS, PTO, cruise, etc.) as required by policy.

Why these DVDs matter

• Factory calibrations — the authoritative files for ECM firmware/ratings.
• Broad compatibility — supports many model years across engines and machine controllers.
• Workshop friendly — offline access; no constant internet required once files are extracted.

System compatibility & footprint
Tested on Windows 10 LTSC (2019). Also works on Windows 7 / 8 / 10 / 11 (x86/x64).

• OS: Windows 7 or newer (32/64-bit)
• CPU: Dual-core 2.0 GHz or better
• RAM: 4 GB (8 GB recommended)
• Storage: ~30–40 GB free for all four DVDs after extraction
• Interface: CAT Communication Adapter (II/III or compatible)

Notes & good practice

• Always back up the ECM configuration before programming.
• Use stable power and a reliable data link — interrupted flashing can brick an ECM.
• After programming, verify product configuration, run self-checks, and print a service report.

Disclaimer
All details are summarized from public information and your screenshots for educational/archival purposes. Any files, if referenced, are stored on third-party cloud services by unknown users; our forum does not host or distribute software and is not responsible for external content. Follow all licensing and local regulations.

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