ASUS PRIME B840M-A fits the AMD B840 chipset and AM5 socket into a micro-ATX board with four DDR5 slots, up to 256GB, for Ryzen 9000, 8000 and 7000 desktop processors. Two DisplayPort outputs and an HDMI port handle video, and storage includes three M.2 slots, with Realtek 2.5Gb Ethernet and a BIOS FlashBack button on the back panel.
Product released: March 1, 2025
Latest firmware version
Version 1804, released September 21, 2026
Last checked for updates: Oct 31, 2026 06:24 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 (A5622.CAP) using BIOSRenamer.
LatestUpdate has tracked 19 versions of ASUS PRIME B840M-A firmware, released between October 17, 2024 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 (A5622.CAP) using BIOSRenamer.
Version 1654 - April 20, 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 rena…
Version 1644 - March 27, 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 13, 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 1403 - November 21, 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 21, 2025: Updated AGESA to ComboAM5 PI 1.2.0.3g. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5623.CAP) using BIOSRenamer
Version 1081 - September 19, 2025: Improve system stability. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5622.CAP) using BIOSRenamer.
Version 1078 - August 5, 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 BIO…
Version 1063 - June 23, 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 irreversible…
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 1006 - February 11, 2025: 1.Updated AGESA to PI 1.2.0.3a Patch A. Please update the chipset driver to version 7.01.08.129 or newer to enhance gaming performance in select games. 2.Impro…
Version 1001 - January 16, 2025: 1.Updated AGESA to ComboAM5 PI 1.2.0.3. Please also update the chipset driver to version 7.01.08.129 or newer to enhance gaming performance for select games. 2…
Version 0825 - December 13, 2024: SHA256: 3e3e40a31dee60904e292e8b2780abe6e54aa291bf125942cc615d3e74c5678b 1. Updated AMD AGESA to version 1.2.0.2b 2. Fixed a few fan-related bugs and improved…
Version 0816 - November 6, 2024: 1. Include Turbo Game Mode: Enhance performance in certain games. 2. Update AGESA Version to Combo AM5 PI 1.2.0.2a: Enhance compatibility and performance. Befo…
Version 0230 - October 17, 2024: First Release Before running the USB BIOS Flashback tool, please rename the BIOS file (A5623.CAP) using BIOS Renamer.
Update prediction
A firmware update is expected soon, between October 11, 2026 and November 17, 2026.
ASUS typically releases firmware updates for this product approximately every 47 days.
ASUS PRIME B840M-A fits the AMD B840 chipset and AM5 socket into a micro-ATX board with four DDR5 slots, up to 256GB, for Ryzen 9000, 8000 and 7000 desktop processors. Two DisplayPort outputs and an HDMI port handle video, and storage includes three M.2 slots, with Realtek 2.5Gb Ethernet and a BIOS FlashBack button on the back panel. It was originally released on March 1, 2025.
What is the latest firmware version of ASUS PRIME B840M-A?
The latest firmware version of ASUS PRIME B840M-A is 1804. It was released on September 21, 2026.
What changed in ASUS PRIME B840M-A firmware version 1804?
ASUS PRIME B840M-A 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 (A5622.CAP) using BIOSRenamer.
Where can I download the latest ASUS PRIME B840M-A firmware?
Details and download instructions for the latest ASUS PRIME B840M-A firmware (version 1804) are on ASUS's official release page: https://www.asus.com/motherboards-components/motherboards/prime/prime-b840m-a/helpdesk_bios/
How often does ASUS release firmware updates for ASUS PRIME B840M-A?
We have tracked 19 firmware versions of ASUS PRIME B840M-A. Based on historical patterns, updates are released approximately every 47 days.
When is the next ASUS PRIME B840M-A firmware update expected?
Based on this product's update history, a firmware update for ASUS PRIME B840M-A is expected soon, between October 11, 2026 and November 17, 2026.
Is ASUS PRIME B840M-A still receiving firmware updates?
Yes, ASUS PRIME B840M-A received a firmware update within the last 3 months. The most recent version is 1804.