Rslogix 5000 Firmware 20.12

⚠️ Never power cycle controller during flash. Use a UPS.

If you have spent any significant time in the world of Rockwell Automation, you know that firmware versions are more than just numbers—they represent distinct eras of hardware compatibility and software features. Among these, Version 20 holds a unique and somewhat legendary status.

While many users were happy to stay on v16 or jump straight to v21, one specific release has become a staple in many modern facilities: RSLogix 5000 Firmware v20.12.

In this post, we are taking a deep dive into Firmware 20.12. We’ll discuss why this specific point release matters, the headache of updating it, and why it remains a critical tool in the automation engineer's arsenal today. rslogix 5000 firmware 20.12

Date: April 2026 Product Family: ControlLogix 5570, CompactLogix 5370 Key Revision: 20.12

Here is the part that trips up even experienced engineers: You cannot always flash straight to v20.12.

Rockwell identified a security vulnerability and a need for a more robust bootloader. Consequently, if you have a controller running older firmware (like v20.01 or earlier), you often cannot flash it directly to v20.12 using ControlFLASH. ⚠️ Never power cycle controller during flash

Instead, you typically had to follow a two-step process:

This process caused headaches for many engineers trying to update controllers in the field. Missing this step often resulted in flashing errors, leaving engineers scratching their heads wondering why the "latest" firmware wouldn't take.

⚠️ Critical: Firmware 20.12 is not compatible with Studio 5000. You must use RSLogix 5000 v20.01.00 (or later CPR 9 SR 5). If you have spent any significant time in

Q: Can I install RSLogix 5000 V20 and Studio 5000 V30 on the same PC? A: Yes, absolutely. Rockwell versions are side-by-side installable. However, install V20 first, then later versions.

Q: Is 20.12 compatible with FactoryTalk View ME/SE? A: Yes, but you must ensure your FactoryTalk Linx (or RSLinx Enterprise) version is at least 6.0. Older versions may fail to browse V20.12 controllers.

Q: My CompactLogix 5370 says it supports V20.11 but not V20.12. Is it safe? A: Yes. V20.12 is a minor revision increment. For the 5370 series, V20.11 was the "release" firmware, but V20.12 is fully backward compatible. Use ControlFlash to force the update.

Q: How do I get firmware 20.12 if I don’t have a Rockwell support contract? A: You cannot legally. Rockwell firmware is protected by copyright and requires a valid TechConnect contract. Contact your local distributor for a one-time download or upgrade your support agreement.

Rockwell has declared that Version 20 firmware is in "Extended Service Life." While they no longer release new features, they have finalized the revision. 20.12 is the last and most polished version of V20. If your system is running V20.01 or V20.03, upgrading to 20.12 is a low-risk, high-reward maintenance action.