Credit: Paul Jones / Android AuthorityTL;DRSamsung has released the fourth One UI 9 beta for the Galaxy S26 series.The 1,250MB update (firmware ZZG4) includes the July 5, 2026, security patch and fixes key issues, including abnormal lock screen clock sizes, missing navigation bars during gaming, cut-off timer notifications, and broken routine actions.Currently live in Germany, India, Poland, the UK, and South Korea, the new update will soon be available in the US as well.Samsung is moving swiftly through its software development cycle, officially releasing the fourth beta of its One UI 9 skin for the Galaxy S26 series. Following the rollout of One UI 9 beta 3 last month, the new beta released today focuses squarely on optimizing performance, smoothing out the UI, and squashing persistent system bugs ahead of the final stable release later this year.We’ve received the fourth One UI 9 update on our Galaxy S26 Ultra in the UK. This Android 17-based update comes with firmware version ending in ZZG4, the July 5, 2026 security patch, and is 1,250MB in size.