Samsung has long been praised for its robust smartphone customization, but with the rollout of One UI 8.5, the tech giant has quietly axed a beloved feature, leaving many users frustrated: third-party font support is officially dead.

The silent removal came to light as the One UI 8.5 update began reaching a wider audience. Previously, Galaxy owners could easily tweak their system fonts—including sideloaded ones—using popular workarounds like zFont. Following the upgrade, however, users quickly realized these tools had been rendered useless.

The culprit behind this change is a recent security overhaul. In the March 2026 security patch, Samsung addressed an "incorrect cryptographic signature verification" vulnerability within the font settings, a flaw that could potentially be exploited via custom fonts. With the implementation of stricter verification protocols, the operating system simply blocks non-standard fonts from running.

Real-world reports indicate a mixed bag for users transitioning to the new update. While some devices managed to retain previously installed custom fonts post-update, the system aggressively reverts to the default typeface the moment a user attempts to tweak their settings. In other instances, a simple device reboot is enough to completely wipe any third-party fonts.

Currently, official fonts downloaded directly from the Galaxy Store remain unaffected, as they comply with the new authentication standards. Yet, for personalization enthusiasts, this walled-garden approach feels significantly more restrictive. For those determined to keep their custom typefaces, the only remaining option involves rooting or deeply modifying the system—a risky endeavor that is largely out of reach for the average consumer.