> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/product-advisories/current-advisories/firmware-upgrade-idemia-sigma-wide-lit.md).

# Upgrade IDEMIA SIGMA fingerprint sensor firmware

Identify affected IDEMIA SIGMA terminals and install the required firmware fix.

**Essential firmware upgrade (FW 4.18.4).**

As described in the [IDEMIA Product Change Notification](https://biometricdevices.idemia.com/s/global-search/069SZ00000188uHYAQ?sharing=true), the SIGMA Lite, Lite+ and Wide are delivered with a **new fingerprint sensor, associated with Firmware 4.16, since June 2024**.

IDEMIA identified that terminals with the new fingerprint sensor are **not providing nominal biometric identification performance**. The symptom can be a **higher rejection rate for all users** of the terminal. The issue was investigated and **corrected in FW 4.18.4**.

## Impacted products

| Gallagher part no. | IDEMIA part no. | Product name                         | Serial no. | Occurrence & action                                |
| ------------------ | --------------- | ------------------------------------ | ---------- | -------------------------------------------------- |
| C864180            | 293678615       | SIGMA LITE (BIO + LED)               | > SN2425   | Rare occurrence. Recommended upgrade to FW 4.18.4  |
| C864181            | 293678636       | SIGMA LITE MULTI (BIO+CARD+LED)      | > SN2425   | Rare occurrence. Recommended upgrade to FW 4.18.4  |
| C864183            | 293678660       | SIGMA LITE+ MULTI (BIO+PIN+CARD+LCD) | > SN2425   | Rare occurrence. Recommended upgrade to FW 4.18.4  |
| C864173            | 293638877       | SIGMA WIDE MULTI (BIO+PIN+CARD+LCD)  | > SN2425   | Low occurrence. **Mandatory** upgrade to FW 4.18.4 |

## Factory implementation

FW 4.18.4 is implemented in IDEMIA's manufacturing for all SIGMA terminals in **May 2025 (SN > 2520)**.

## Field remediation

Download firmware 4.18.4 from [biometricdevices.idemia.com](https://biometricdevices.idemia.com/) and upgrade affected products.

Contact: Paul Botha, Product Manager - Integrations.

***

🔗 **Related**

* [IDEMIA device communication protocols](/knowledge-hub/products/product-advisories/current-advisories/communication-protocols-and-idemia-dev.md). Check protocol support and current firmware versions.


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