ASUS PRIME B850-PLUS is an ATX AM5 board on the AMD B850 chipset, with four DDR5 slots up to 256GB and a PCIe 5.0 x16 slot for Ryzen 9000 and 7000 processors. Its three M.2 slots include one PCIe 5.0 x4 slot, the rear panel adds four USB 10Gbps ports, and a Thunderbolt (USB4) header and BIOS FlashBack button are onboard.
Product released: January 1, 2025
Latest firmware version
Version 1804, released September 21, 2026
Last checked for updates: Oct 31, 2026 05:47 UTC
What's new in version 1804
1. Update to AGESA ComboAM5 PI 1.3.0.1d.
2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency operation.
Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
LatestUpdate has tracked 16 versions of ASUS PRIME B850-PLUS firmware, released between March 4, 2025 and September 21, 2026.
Version 1804 - September 21, 2026: 1. Update to AGESA ComboAM5 PI 1.3.0.1d. 2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency op…
Version 1686 - July 2, 2026: Updated AGESA ComboAM5 PI 1.3.0.1b Patch A to support the GNR Transparent Secure Memory Encryption (TSME) feature. Before running the USB BIOS Flashback tool,…
Version 1681 - June 22, 2026: 1.Update AGESA ComboAM5 PI 1.3.0.1b. 2.Add support for EXPO ULL memory profiles. 3.Optimize ECC-UDIMM memory performance. Before running the USB BIOS Flashback…
Version 1670 - April 29, 2026: New memory profile support. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1654 - April 27, 2026: "• Update AGESA ComboAM5 PI 1.3.0.1. Note: This BIOS version cannot be rolled back to previous versions. Before running the USB BIOS Flashback tool, please ren…
Version 1644 - March 23, 2026: "1. AGESA updated to ComboAM5 PI_1.3.0.0a. 2. Provide additional stability margin during high-frequency DDR5 training. 3. Addresses potential boot failures and…
Version 1642 - February 26, 2026: 1. AGESA updated to ComboAM5 PI_1.3.0.0a. 2. Provide additional stability margin during high-frequency DDR5 training. 3. Addresses potential boot failures and…
Version 1627 - February 11, 2026: "1. AGESA updated to ComboAM5 PI_Pre1.3.0.0 for better security. 2. Enhanced system performance and stability. 3. Improved memory compatibility for JEDEC-compl…
Version 1402 - November 26, 2025: "1.AGESA updated to ComboAM5 PI 1.2.7.0. 2.Improves compatibility with various CPUs and devices. Note: This BIOS version cannot be rolled back to previous vers…
Version 1087 - October 17, 2025: Updated AGESA to ComboAM5 PI 1.2.0.3g. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1081 - September 19, 2025: Improve system stability. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1078 - August 1, 2025: 1.Updated AGESA to ComboAM5 PI 1.2.0.3f. 2.Enhanced system performance, stability, device compatibility, and overclocking support. Before running the USB BIOS…
Version 1065 - June 17, 2025: 1. Updated AGESA to ComboAM5 PI 1.2.0.3e for upcoming CPU compatibility. 2. Enhanced system performance and stability. 3. Important: This update is irreversibl…
Version 1028 - April 30, 2025: This update enhances compatibility with high-capacity memory modules and improves overall system performance. Before running the USB BIOS Flashback tool, pleas…
Version 1022 - March 7, 2025: 1. Enhanced system performance with support for 9950X3D and 9900X3D processors. 2. Included AI Cache Boost to enhance performance and compute power when using…
Version 0602 - March 4, 2025: First Release Before running the USB BIOS Flashback tool, please rename the BIOS file ( A5659.CAP) using BIOSRenamer.
Update prediction
A firmware update is expected soon, between October 8, 2026 and November 14, 2026.
ASUS typically releases firmware updates for this product approximately every 47 days.
ASUS PRIME B850-PLUS is an ATX AM5 board on the AMD B850 chipset, with four DDR5 slots up to 256GB and a PCIe 5.0 x16 slot for Ryzen 9000 and 7000 processors. Its three M.2 slots include one PCIe 5.0 x4 slot, the rear panel adds four USB 10Gbps ports, and a Thunderbolt (USB4) header and BIOS FlashBack button are onboard. It was originally released on January 1, 2025.
What is the latest firmware version of ASUS PRIME B850-PLUS?
The latest firmware version of ASUS PRIME B850-PLUS is 1804. It was released on September 21, 2026.
What changed in ASUS PRIME B850-PLUS firmware version 1804?
ASUS PRIME B850-PLUS firmware version 1804 includes the following changes: 1. Update to AGESA ComboAM5 PI 1.3.0.1d.
2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency operation.
Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Where can I download the latest ASUS PRIME B850-PLUS firmware?
Details and download instructions for the latest ASUS PRIME B850-PLUS firmware (version 1804) are on ASUS's official release page: https://www.asus.com/motherboards-components/motherboards/prime/prime-b850-plus/helpdesk_bios/
How often does ASUS release firmware updates for ASUS PRIME B850-PLUS?
We have tracked 16 firmware versions of ASUS PRIME B850-PLUS. Based on historical patterns, updates are released approximately every 47 days.
When is the next ASUS PRIME B850-PLUS firmware update expected?
Based on this product's update history, a firmware update for ASUS PRIME B850-PLUS is expected soon, between October 8, 2026 and November 14, 2026.
Is ASUS PRIME B850-PLUS still receiving firmware updates?
Yes, ASUS PRIME B850-PLUS received a firmware update within the last 3 months. The most recent version is 1804.