Here are some general steps you might follow

1. Gather Tools: You'll likely need a set of small screwdrivers (Phillips and possibly others depending on the device), prying tools (plastic spudger or guitar picks), and possibly tweezers.
2. Prepare Workspace: Work on a clean, well-lit surface. Consider using a tray or organizer to keep track of screws and components.
3. Power Off: Make sure the device is completely powered off before starting the disassembly process.
4. Remove External Components: If there are any external components like the SIM card tray or memory card, remove them first.
5. Open the Device: This typically involves removing screws from the back cover or frame. Some devices may have clips or adhesive holding the components together. Take your time and apply gentle pressure.
6. Disconnect Battery: If possible, disconnect the battery to avoid any potential short circuits.
7. Disconnect Components: Carefully disconnect any cables or ribbon connectors attaching the various components like the display, motherboard, and cameras.
8. Remove Components: Once all connections are disconnected, carefully lift out the components. Be mindful of any fragile cables or connectors.
9. Reassembly: If you're disassembling for repair or maintenance, make sure to keep track of how everything was assembled. Take photos or notes if necessary.
10. Testing: After reassembly, test the device to ensure everything is working correctly before fully sealing it back up.

Remember, this is a general overview, and the specifics may vary depending on the exact model of your device. Always proceed with caution and consider seeking professional help if you're unsure.

Using the tiny metal spudger, make a space between the back cover and the body of the device at the top of the memory card slot.

It is not possible to remove the rear cover with the small metal spudger; it is just meant to create a space between it and the remainder of the device.

To detach the back cover, if at all feasible, use a regular nylon spudger as it is much softer and less prone to scratch or damage the device.

To remove the back cover, use the intermediate metal spudger instead of the tiny one. Starting at the top of the memory card slot, move the intermediate metal spudger around the device's perimeter to accomplish this.

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After removing the back cover, the interior part of the device is visible in the second picture.
Using the bent precision tweezers, disconnect the motherboard's electrical connector.
To separate the battery from the remainder of the device, use the plastic spudger's flat end.

An alternate technique is to use the plastic spudger to loosen the battery, and then pull on the paper tab labeled "Pull (Hands Only)" to remove the battery.
After removing the battery and back cover, the device should have the appearance shown in the second figure.

what is tablet Samsung Galaxy Tab A 8,0" SM-T290

The Samsung Galaxy Tab A 8.0" SM-T290 is an Android tablet produced by Samsung Electronics. It is part of the Galaxy Tab A series, which is aimed at providing mid-range tablets with a balance of performance and affordability. Here are some key features of the Samsung Galaxy Tab A 8.0" SM-T290:

1. Display: As the name suggests, it features an 8.0-inch touchscreen display.
2. Processor: The tablet is powered by a quad-core processor, though the specific model may vary depending on the region.
3. RAM and Storage: It typically comes with 2GB of RAM and 32GB of internal storage, which can be expanded via a microSD card slot.
4. Operating System: The Galaxy Tab A 8.0" SM-T290 runs on the Android operating system, customized with Samsung's user interface.
5. Battery Life: It is equipped with a battery that provides decent battery life for typical tablet usage.
6. Connectivity: The tablet supports Wi-Fi connectivity, allowing you to connect to wireless networks for internet access. Some models may also offer cellular connectivity options.
7. Cameras: It usually features both front and rear-facing cameras for capturing photos and videos.
8. Design: The tablet sports a sleek and lightweight design, making it portable and easy to handle.

Overall, the Samsung Galaxy Tab A 8.0" SM-T290 is designed to offer a convenient and affordable tablet experience for users who want a device for multimedia consumption, light productivity tasks, and casual gaming.