You cannot simply download an APK to install a custom ROM. You need a PC and tools.
| Feature | Stock EMUI 5.1 (Android 7) | LineageOS 18.1 (Android 11) | | :--- | :--- | :--- | | | 58 seconds | 32 seconds | | RAM Usage at idle | 1.2 GB / 2 GB | 780 MB / 2 GB | | Geekbench 5 (Single) | 135 | 148 | | Geekbench 5 (Multi) | 490 | 542 | | App Opening (Chrome) | 4.5 seconds | 2.8 seconds | | Netflix | HD (Widevine L1) | SD (L3) | huawei mediapad t3 10 custom rom
