Sony A1: B&H Photo / Amazon / Moment / Adorama Sony released firmware 4.00 for the Sony a1, which you can get started downloading here. Things To Keep in Mind Before Performing the Update Updates should be installed in chronological order. When updating from Ver. 1.32 or earlier, you need to update to Ver. 2.01 first before proceeding with the Ver. 4.00 update. The update software for … Continue reading Sony A1 Firmware 4.00 Released