Sony temporarily made a7 IV firmware version 1.1 available as shared below. The firmware was since taken down, with this notice provided:
"It was confirmed that some products that updated may not operate properly in some cases. Distribution will be suspended until we can inform you of modified version. (August 24, 2022)" [Sony]
I expect that we will see this update become available again very soon.
Here is the original press release from Sony:
New Alpha 7 IV Firmware Update Enables Lossless RAW File Options and Improved Accuracy and Operability
SAN DIEGO, CA – August 23, 2022 – Sony Electronics Inc. today announced the v1.1 firmware update for the Alpha 7 IV full-frame mirrorless interchangeable lens camera, adding Lossless Compressed RAW in three sizes for still images, shutter speed and ISO setting retention, touch shutter function, improved Eye AF (autofocus) accuracy and more. ? ?
The update adds Lossless Compressed RAW files in S, M and L (small, medium or large) file sizes – a highly requested feature. Selecting L size preserves the same image quality as an uncompressed RAW format while significantly reducing the file size. The M and S sizes record fewer pixels than the L size, providing even smaller RAW file sizes.
Alpha 7 IV v1.1 allows photographers to retain shutter speed and ISO settings for flash photography. This newest update also offers a Touch Shutter Function and improves the accuracy of the Eye AF feature.
Other updates in the Alpha 7 IV v1.1 include:
Alpha 7IV v1.1 is available now and can be downloaded HERE.
Download instructions can be found HERE.