Android 16.2.1 for Teracube 2s Batch Sapphire (SN:2025)

[Terabot]

NOTE 1 : These builds ONLY WORK for the Teracube 2s (SN: 2025) Sapphire, and not Teracube 2e batch (SN:2021/SN:2020).

NOTE 2: 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 (16.2.1+e954766) Android 16 QPR2 for Teracube 2s 2025

What’s New?

• March 2026 security patches
• Disable blur effects
• Improvements to battery & perfomance
• Material 3 expressive design updates
• New app pinner to counter A16 aggressive app killing → Settings → Apps → App pinning

Steps to Upgrade:

1. Download the upgrade zip
   file directly on the phone (or transfer the zip to the phone).
2. Goto Settings > System > Updater (or Teracube Updater)
3. Click top-right 3 dots > Local update or Click on the top-right File icon
4. 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.
5. Select the file and continue the update process.
   Note: If the Updater closes or crashes, then try again.
6. Upgrade process will take a while.
7. Reboot the phone after the updater says “Update installed”.
8. 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.

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[ElBurro17]

I haven’t been able to apply this update despite following all of the instructions. Each time the updater states “Unable to import local update.”

Zip file downloads fine as far as I can tell (I have downloaded it multiple times to the same result). I have a Teracube 2s running the latest e/os update (3.6). Not sure if anyone else is having this problem on e/os or in general, but it is definitely frustrating given that these are very important security patches.

Please let me know how to fix this issue.

[Sahil_Sonar]

If you are applying this on /e/OS it wouldn’t apply (You will have to go back to stock ROM). On Teracube stock updater it takes a few retry before it applies fine.

[Terabot]

New update is here!