u/htetznaing

Zyper is now live on the Play Store: https://play.google.com/store/apps/details?id=com.htetz.zyper

By default, MIUI and HyperOS aggressively reset third-party .mtz themes and custom fonts after just 30 to 60 seconds.

Zyper is a lightweight utility designed to solve this. It runs a highly optimized background service to bypass the system restriction, permanently locking in your applied customizations so they never revert to the default.

Features:

• Stops the Reset: Keeps third-party .mtz themes and fonts permanently applied.
• Broad Support: Fully compatible with both MIUI and HyperOS.
• Battery Optimized: The background service is designed for minimal power consumption.
• Simple UI: Clean, straightforward, and incredibly easy to use.

I made this prototype app 2 days ago while I was in a private group for system shell access. I had already seen fahadalijaved's SamFonts in that group, but it relies on Knox. I built this without Knox, using only System Shell (UID 1000).

I don't plan to share this publicly because it is tied to their private group. I originally just wanted to share the app within that community, but after I finished it, I found myself no longer in the group. Since joining, I hadn't said anything in the chat; I just followed the guides to use the exploit and get system shell. I understood the private group rules and didn't do anything wrong.

However, a lot of you guys have been DMing me and sharing several posts in this sub. So, I want to make one thing clear: the main point here isn't the font application method itself. It's the System Shell access (UID 1000), which is highly privileged, like ROOT (UID 0). Normal Shizuku is just ADB (UID 2000) and doesn't have permission to access the /data directory where Samsung stores its font files and configs.

Since Samsung blocked all possible loopholes, we still don't have a universal method to apply fonts for everyone. The newly found methods rely on System Shell (1000), which isn't meant for end users.

But huge thanks to Gabriel2392, VikramAditya, and fahadalijaved for the System Shell exploit, btw!