NOTE 1 : These builds ONLY WORK for the Teracube 2e 2nd batch (SN: 2021) Emerald, and not 1st batch (SN:2020). Please read the differences here carefully and install accordingly.
If you are looking for SN:2020 T2e (Zirconia), you can find it here.
NOTE 2: These builds are currently only pass the Device Integrity level in Play Integrity. This means that most applications will function correctly, but Google Wallet will not work .We strongly recommend users of Android 13 and 14 builds to migrate to Android 15 . This is because the older Android 13/14 builds are no longer passing even the basic integrity check. We’ve explored all options, but implementing Remote Key Provisioning (RKP) a strict requirement for Strong Integrity is simply not feasible for us right now.
NOTE 3: It is expected for the device to stay longer on Teracube logo for the first time after installing the upgrade & The device may respond slow for some time after upgrade, apps are optimising in background. We recommend waiting 15min on idle post upgrade before using it for an optimal experience.
We are thrilled to share our 4th major upgrade (15.0.1+006f77f) Android 15 for Teracube 2e 2021 as it launched with Android 11 all the way to Android 15 
What’s New?
Android 15 features and improvements
Security patches updated to 2025-10-05
Improved system perfomance
Enhanced battery optimization
Updated system apps
(Note: If you’re currently on Android 11/13/14, those builds no longer pass basic integrity - we strongly recommend upgrading to Android 15)
Steps to Upgrade:
- Download the upgrade zip file directly on the phone (or transfer the zip to the phone).
- Goto Settings > System > Updater (or Teracube Updater)
- Click top-right 3 dots > Local update or Click on the top-right File icon
- Tap “Internal storage” and browse to Downloads or wherever you transferred/downloaded the update zip file.
Note 1 : If Internal storage does not show anything, then reboot the phone.
Note 2 : Do not download the update to SD card.
Note 3 : Before you update, make sure you have at least 6GB of free storage and your battery is at least 50% charged. This will help ensure a smooth update process. - Select the file and continue the update process.
Note: If the Updater closes or crashes, then try again. - Upgrade process will take a while.
- Reboot the phone after the updater says “Update installed”.
- First boot after upgrade can take several minutes.
Do note, after the update, you’ll need to re-enroll your fingerprint and some users have reported that they lose their launcher - icon and widget arrangement. We’d suggest you take a screenshot of your homescreen before performing the update!
Let us know how it went and post your questions/feedback here. Please keep the comments related to this update itself.
If you experience any errors/issues, you can install the original factory software using the automated installer or SP Flash.