Upgrade OkcarOS on
Samsung Galaxy Tab S2 8.0 Wi-Fi (2016)

Basic requirements

1. Read through the instructions at least once before actually following them, so as to avoid any problems due to any missed steps!
2. You actually want to upgrade your device to the newest version - if you wish to downgrade to an earlier version of OkcarOS, follow your device’s instructions for installing OkcarOS the first time.

Manually upgrading OkcarOS

The updater app does not support upgrades from one version of OkcarOS to another, and will block installation to any update for a different version. Upgrading manually requires similar steps to installing OkcarOS for the first time.

1. Verify your device is using the latest TWRP. Simply download the latest recovery file, named something like twrp-x.x.x-x-gts28vewifi.img. Follow your device’s installation guide to see how you can update your recovery image.
   warning

   Important: These instructions may not work if you choose to use a different recovery!
2. Build a OkcarOS install package.
3. If you are currently using (or now want to use) an application package add-on such as Google Apps, you have the following options:
   • keep using them: Download the appropriate version now (use the arm64 architecture)
   • remove them: You can only do so by performing a factory reset, which will also remove all your data.
   • start using them: You can only do so by performing a factory reset, which will also remove all your data. Download the appropriate version now (use the arm64 architecture)
4. Make sure your computer has working adb. Setup instructions can be found here.
5. Enable USB debugging on your device.
6. Additionally if you are on OkcarOS 16.0 or below, open Settings, then “System”, then “Developer Options”, then select “Root Access Options”, and finally “ADB Only”. Now, run adb root
7. Run adb -d reboot sideload.
   warning

   Important: The device may reboot to a blank black screen, fear not, this is a known bug on some recoveries, proceed with the instructions.
8. Run adb sideload /path/to/zip (inserting the path to your OkcarOS package).
   check

   Tip: Normally, adb will report Total xfer: 1.00x, but in some cases, even if the process succeeds the output will stop at 47% and report adb: failed to read command: Success. In some cases it will report adb: failed to read command: No error or adb: failed to read command: Undefined error: 0 which is also fine.
9. (Optionally): If you want to install any add-ons, click Advanced, then ADB Sideload, then swipe to begin sideload, then adb -d sideload /path/to/zip those packages in sequence.
   info_outline

   NOTE: If you previously had any Google Apps add-on package installed on your device, you must install an updated package before the first boot of Android! If you did not have Google Apps installed, you must wipe the Data partition (or perform a factory reset) to install them.
10. Once you have installed everything successfully, run adb -d reboot.

Get assistance

After you’ve double checked that you followed the steps precisely, didn’t skip any and still have questions or got stuck, feel free to ask on our subreddit or in #OkcarOS on Libera.Chat.