Note: This device is very old (2013), has a dual-core CPU and only 1GB of RAM. Do not expect modern flagship performance. This will void your warranty (long expired) and wipe your data.
Since the SM-T211 is the 3G variant of the Tab 3 7.0, you need ROMs specifically compatible with its Marvell PXA986 SoC. custom rom for samsung galaxy tab 3 sm-t211
The Critical Warning: Because this device uses a Spreadtrum (Unisoc) processor, it is significantly harder to develop for than Qualcomm or Exynos devices. The "Custom ROM" scene for this specific model is sparse. Most ROMs for the SM-T210 (WiFi) will brick the SM-T211. Note: This device is very old (2013), has
Your Action Plan:
4. App Compatibility This is the main reason to flash a ROM today. On stock Android 4.4, modern apps (Chrome, WhatsApp, modern games) no longer support the OS. Yes if: You want to repurpose it as
Lag: If the ROM feels slow, try a different kernel or use a "Lite" GApps package (Pico or Nano).