OnePlus 13T eSIM Settings Enabler (OxygenOS)

A Magisk/KernelSU module that exposes the native eSIM management entry (Settings > Mobile network > SIM & eSIM settings > eSIM) on a OnePlus 13T converted to OxygenOS (13s firmware).

Intended for eUICC-enabled physical SIM cards (5ber, eSTK.me, etc.).

Internal eUICC does NOT work under the OxygenOS conversion. The Settings entry, the eSIM master toggle and the GPIO slot switch all function (the toggle physically muxes SIM2 → the internal NXP SN220U eUICC), but with the mux switched the modem reads the internal eUICC and gets CARDSTATE_ABSENT with an empty ATR/EID. Public reports show the same failure when China OnePlus models are flashed to global ROM — the internal eUICC behaves "as if removed" — so this is disabled/unprovisioned below the application processor (modem NV, or a CN-board SN220 that is not personalized) and no AP-side module can fix it. Leave the eSIM toggle OFF; turning it ON only disconnects your physical SIM2.

See docs/esim-hardware-analysis.md for the full hardware/software breakdown (SN220U, the GPIO mux, the secure-element evidence, and why EDL cannot help).

The working eSIM path is a removable eUICC card (eSTK.me / 5ber / 9eSIM) in the physical SIM2 slot. After switching the card's ATR Mode to eUICC it is managed natively from the stock Settings eSIM screen (verified on device). See docs/removable-euicc-native-setup.md.

Background

The OxygenOS 13s builds already ship the entire AOSP/Google eSIM stack: the android.hardware.telephony.euicc feature is declared in /my_product/etc/permissions/com.oplus.android-features.xml, the Google LPA (com.google.android.euicc, EuiccGoogle) is preinstalled as a privileged product app, and EuiccController is up. The stack is fully functional — am start -a android.telephony.euicc.action.MANAGE_EMBEDDED_SUBSCRIPTIONS opens the LPA and reaches the QR download screen.

The only thing missing is the Settings UI entry. OplusSimSettings (in TeleService / com.android.phone) gates the "eSIM" preference on the vendor prop ro.vendor.oplus.esim.support (EuiccDemand.getEsimDisplayType):

value	meaning
0 / undefined	entry hidden (OxygenOS 13s default)
1	eSIM shares the SIM2 slot via GPIO switching (ColorOS 13T style)
2	independent eUICC, no slot sharing

This module simply sets ro.vendor.oplus.esim.support=2 via system.prop (with a resetprop fallback in post-fs-data.sh). No files are mounted.

Requirements

• OnePlus 13T converted to OxygenOS (13s), rooted (Magisk or KernelSU).
• oneplus13t-fix-camera with the eSIM HAL fix (the version that no longer masks vendor.oplus.hardware.esim@1.0-service with the eid binary). The Settings enable flow talks to the stock IOplusEsim HAL; older fix-camera versions bind-mounted a replacement binary from /data, which init can never exec (nosuid_transition denial), leaving the HAL in a crash loop and the eSIM screen stuck on "Enabling...".

Notes

• If the eSIM toggle ever misbehaves with 2, try 1 (GPIO switching variant used by ColorOS on the 13T).
• If a future OxygenOS update defines ro.vendor.oplus.esim.support by itself, this module becomes unnecessary.