In October 2018, Sony released firmware version 2.0 for its a7 III and a7R III mirrorless cameras. Two months later, in early December, firmware version 2.0 was removed from Sony's website unexpectedly, due to an issue where some users were experiencing lost data when using an SD card that had already been used multiple times.

Specifically, Sony cited the following reasons for pulling firmware version 2.0 for the a7 III and a7R III cameras:

  1. In rare cases, your α7R III or α7 III model may stop functioning while writing RAW data onto an SD card that has already been used multiple times.
  2. With the α7R III, taking a picture while using the Auto Review function may occasionally cause the camera to stop responding.

At the time of the firmware removal, Sony said it would 'provide updated system software addressing the above issues in mid-December.' Well, mid-December is here and as promised, Sony has released an update fixing the aforementioned issues.

Firmware version 2.10 features the same upgrades and features as firmware version 2.0, while addressing the data loss and Auto Review issues that plagued the update.

Users can upgrade to firmware version 2.10 for the a7 III (Windows, macOS) and a7R III (Windows, macOS) mirrorless cameras on Sony's website.