On December 16 last year, Apple released a firmware update to the AirPods Pro, upgrading the version number from 2B588 to 2C54. However, users have reported that this update may be detrimental to noise reduction. More confusingly, Apple quickly removed the 2C54 firmware, so not all AirPods Pro users are in the latest version. At the behest of everyone, the technical review site RTINGS.com decided to compare the two versions of the firmware to assess the differenceins in detail.
(Instagram via MacRumors)
Based on the results released today by RINGS, it can be confirmed that the 2C54 firmware objectively worsens the active noise reduction of the AirPods Pro:
Update 01/10/2020: After updating to the 2C45 firmware, we retested the headset. The results showed that the sense of noise reduction was significantly reduced and mainly concentrated in the bass area.
In other words, with ANC turned on, The AirPods Pro is less effective than older firmware in isolating the roar of an airplane or bus engine.
However, the new firmware is not without results, at least in other test areas, the 2C54 improves low-frequency response performance and pitch.
If you’re not sure which version of the firmware you’re using, you can move to Settings – General – About AirPods Pro.