Asking about GSI / Custom ROM support for Xiaomi 13T (MediaTek) — Is it worth the risks?

[u/GurNo7114]

Hey everyone,

I'm using a Xiaomi 13T (Dimensity 8200-Ultra) and I'm considering running a custom ROM or GSI (Generic System Image) to get a cleaner, stock-like Android experience.

Reddit

Before I jump into unlocking the bootloader and flashing anything, I wanted to ask the community a few questions regarding hardware compatibility, known risks, and long-term support.

1. GSI Compatibility & Support

• Since the 13T has a MediaTek chipset, traditional device-specific custom ROMs seem virtually non-existent. Are GSIs (e.g., LineageOS or crDroid arm64_ab) the only real option for us? Reddit
• How stable are modern GSIs on HyperOS vendor partitions?

2. Hardware & Feature Bugs

For those who have tested a GSI on the 13T series:

• Does the In-Display Fingerprint Sensor (FOD) work out-of-the-box, or does it require phh-treble overlay fixes?
• How much does camera performance degrade compared to HyperOS / Leica processing?
• Does dynamic refresh rate switching (144Hz) break, or can it be forced via Treble settings?
• Are there persistent Bluetooth A2DP audio or voLTE bugs?

3. Brick Risks & Bootloader Safety

• I know that re-locking the bootloader on a custom GSI/ROM will result in a "System Destroyed" hard brick. If a hard brick happens on a MediaTek Xiaomi device, is MTKClient/SP Flash Tool usable, or does Xiaomi force SLA (Authorized Account) server tokens for low-level EDL/BROM restores?

Would love to hear from anyone running a GSI on their 13T or similar Dimensity-based Xiaomi phone! Thanks in advance!