C# Odin Source Code for Samsung Download Mode (Odin 3.14.4 Protocol)
SharpOdinClient Pro is a professional C# Odin source code project: a fully managed .NET re-implementation of the Samsung ODIN / LOKE download-mode protocol, reverse-engineered from the binaries shipped with Odin3 v3.14.4 (SS_DL.dll + Odin3_v3.14.4.exe). It lets your own .NET application detect Samsung devices in download mode and flash firmware (tar, tar.md5, lz4, img, bin), read/write PIT, run secure-download authentication, and drive Mass D/L — all without depending on a closed binary tool.
This C# Odin source code is built for software owners, tool developers, research teams and service-tool builders who want their own private, branded Samsung flashing engine instead of wrapping someone else’s EXE/DLL. The flashing core is 100% managed C# — there is no P/Invoke into SS_DL.dll — so you ship clean, debuggable, fully owned code.
Why a New C# Odin Source Code?
We previously released the open-source SharpOdinClient on GitHub, and the community has used it widely for basic flash, info and PIT operations. But that library targets an older protocol generation and runs into real-world failures on the newest Samsung devices — for example, issue #18: flashing super.img on Android 15 / Android 16 devices (e.g. Galaxy A55 / Exynos 1480, Galaxy S25 / Snapdragon 8 Elite) throws an exception and the write fails.
SharpOdinClient Pro is a ground-up, evidence-backed re-implementation of the Odin 3.14.4 protocol that resolves those problems. Every phase is mapped to a cited address in the original binaries, and the known failure modes — including the Android 15/16 super.img exception and the secure check fail: (radio) error — are fixed at the protocol level.
Bottom line: if the free SharpOdinClient cannot flash a modern device, SharpOdinClient Pro is the upgrade path — newer protocol, secure-download auth, correct buffer sizing, and a commercial license you can ship inside your own product.
What This C# Odin Source Code Does
SharpOdinClient Pro reproduces the full Odin3 v3.14.4 download flow with the exact phase order recovered from the master orchestration routine:
FileAnalysis → SetupConnection → Initialization → Auth → SetPit → GetPit → FirmwareUpdate → EndSession
- ODIN / LOKE handshake over a Windows serial COM port using overlapped
WriteFile/ReadFile. - 1024-byte control packets with the 8-byte response echo, matching the original packet builder byte-for-byte.
- Secure-download authentication (command group 0x69) for protocol version ≥ 4 — required by many newer Samsung devices. Includes the DEVINFO blob exchange and magic validation.
- Per-storage-type transfer buffer sizing (eMMC 30 MiB / UFS variants / 4 MiB / 1 MiB), plus the correct 100 MiB sequence cap for the CP / radio path — this is the fix for
secure check fail: (radio). - PIT read, write and on-device dump through the verified RequestPit flow.
- LZ4 decode on the PC (standard
.lz4frame + Samsung’s custom chunk container) so the device only ever receives decompressed bytes. - Home Binary /
download-list.txthandling and automaticUFS_Header.binskipping. - One Click (
.ock) package loading with trailing-footer signature handling. - Mass D/L — parallel flashing to every detected device with the
All threads completed. (succeed X / failed Y)summary. - Faithful logging with Odin’s exact prefixes (
<OSM>,<ID:box/COM>) and message order.
Full Video Demonstration
Watch the complete walkthrough — device detection, reading info/PIT, a full firmware flash, secure-download auth on a modern device, and Mass D/L:
Open-Source SharpOdinClient vs. SharpOdinClient Pro
The free SharpOdinClient is a great starting point and remains available under GPL-3.0. SharpOdinClient Pro is the commercial, newer-protocol engine intended for production use and for shipping inside your own software. Here is an honest, technical comparison:
| Area | SharpOdinClient (Open Source) | SharpOdinClient Pro (Commercial) |
|---|---|---|
| Protocol base | Older Odin generation | Reverse-engineered from Odin3 v3.14.4, with cited binary addresses for each phase |
| Target framework | .NET Framework 4.5.1 | .NET Framework 4.7.2, modern Span/BinaryPrimitives data paths |
Android 15 / 16 super.img |
Fails with an exception (issue #18) | Fixed — flashes correctly on A55 / S25-class devices |
| Secure download (0x69 auth) | Not implemented | Full DEVINFO-blob exchange + magic validation for protocol v4+ devices |
| Transfer buffer sizing | Generic sizing | Per-storage-type sizing + CP/radio 100 MiB cap → fixes secure check fail: (radio) |
| Mass D/L | Not included | Parallel multi-device flashing with per-slot progress + summary line |
| One Click / Home Binary / download-list.txt | Not included | Included (.ock footer handling, selective flash, UFS_Header.bin skip) |
| GUI | Library only (you build your own UI) | Pixel-faithful WinForms clone of the Odin3 v3.14.4 window, plus CLI |
| Architecture | Compact, single-purpose | Layered (Protocol / Transport / Pit / Firmware / Compression), test-covered with a mock LOKE device |
| License | GPL-3.0 (copyleft — derivatives must be open-sourced) | Commercial license — use inside your private / internal / closed-source product |
| Support | Community / best-effort | Private support for licensed buyers |
How to choose: if you just need basic flash/info/PIT on older devices and you are happy releasing your code under GPL-3.0, the open-source library is enough. If you need to flash modern Android 15/16 devices, require secure-download authentication, want Mass D/L and the One Click / Home Binary workflows, or you intend to ship a closed-source commercial tool, choose SharpOdinClient Pro.
Screenshots From the Source Code
Licensing and Purchase
The full SharpOdinClient Pro source code is available through private licensing. Licensed buyers may use the source inside their own private, internal or commercial software project according to the license agreement.
The source code must not be resold, exchanged, published for free, gifted, leaked, mirrored publicly or shared with third parties.
For pricing, licensing, support scope or technical questions, contact us on Telegram: https://t.me/GsmCoder
Documentation & Open-Source Reference
- Open-source predecessor (showcase / reference): github.com/Alephgsm/SharpOdinClient
- Open-source README: README.md
- Resolved limitation (Android 15/16
super.img): issue #18
Disclaimer
SharpOdinClient Pro is intended for lawful development, research, maintenance and authorized service scenarios. Flashing firmware can brick devices, and behavior depends on chipset, bootloader, firmware package, storage type, security state and local regulations. Use this project only for authorized devices and lawful service workflows, at your own risk.
Author: 0x0A — GSM Alphabet