PSA | Latest AGESA firmware can brick Precision Boost Overdrive on AMD 400-series motherboards

Earlier this week, we reported that motherboard OEMs have started seeding the latest AGESA 0.0.7.x firmware to bring in support for the upcoming AMD Ryzen 3000 CPUs. While it is good to know that most motherboards can support the Zen 2 chips, users who have gone ahead with the update report of issues in getting Precision Boost Overdrive (PBO) to work automatically.

User umeng2002 on the Overclock forums for the Asus Prime X470-Pro board posted,

I can confirm that the latest PBO in the latest BIOS is broken.
With the prior BIOS, turning on PBO would max all the amp ratings for the highest performance possible from PBO.
With the current BIOS, all the PBO settings (read via Ryzen Master) are at default levels.
YOU NEED TO USE MASTER RYZEN with the current BIOS to get PBO to work.
I'm emailing Asus about this. What's the point of a BIOS option if you need software for it to function?"

As you might be aware, PBO factors in three major data points to determine the maximum possible boost. These include SoC power, VRM current, and temperature. The OP notes that with the new BIOS (4406), only the TDP is being maxed out to 1000 W while the current values are left out at default values. In the older BIOS, all three parameters were adjusted by the BIOS without the need to use Ryzen Master. The OP also states that Ryzen Master PBO settings go back to previous values when the computer wakes from sleep. Users have reported similar issues with the Asus Strix X470-F and the MSI X470 Gaming M7 AC boards as well after flashing the new AGESA update.

Apparently, Asus Support is offering a new BIOS version 4602 upon request that fixes the PBO issue but the file is not available for public download yet. The new AGESA firmware is targeted more towards the Ryzen 3000 chips and supports an updated PBO algorithm that is not fully compatible with the existing one in the Pinnacle Ridge CPUs.

In case you are experiencing similar issues on your X470 boards after flashing the latest firmware and you absolutely need a working PBO, check if you are able to downgrade your BIOS to the last working version (4204 or 4207 for Asus boards). If you haven't taken the jump yet, we'd suggest holding on till OEMs release an updated AGESA version that hopefully fixes the bug.