Asus PRIME B850-PLUS-CSM

Launch Stability & Compatibility

The platform initializes with v0602, establishing the baseline firmware for the B850 architecture. Update v1022 expands CPU support to include Ryzen 9 9950X3D and 9900X3D processors, while introducing AI Cache Boost to optimize compute performance for AI-based workloads. Memory controller logic is refined in v1028, which improves signal integrity for high-capacity DIMM modules to ensure stability in high-density memory configurations.

Feature Maturity & Hardware Support

Firmware v1065 integrates AGESA 1.2.0.3e, which mitigates the TPM Out-of-Bounds Read vulnerability (CVE-2025-2884) and refines voltage safety limits for X3D series processors; due to security hardening, this update prevents rollback to previous versions. Subsequent optimization in v1078 updates the codebase to AGESA 1.2.0.3f, which enhances device compatibility and stabilizes overclocking parameters. General system stability is further addressed in v1081 and v1087, with the latter advancing the protocol to AGESA 1.2.0.3g.

Critical Security & Power Management

The most significant architectural update arrives in v1402, which implements AGESA 1.2.7.0. This release enables preliminary support for next-generation 2026 processors, updates the PSP firmware, and resolves USB compatibility issues. Due to critical security updates within the AGESA 1.2.7.0 container, v1402 serves as a permanent checkpoint, disabling the ability to flash older BIOS revisions.