The "gtel3g" variant of the Galaxy Tab 4 7.0 requires specific kernel tuning to handle its Marvell PXA1088 chipset. This specific April 2018 unofficial build addressed several critical stability issues that plagued earlier releases.
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To understand why this firmware build is so significant, you must look at the hardware limitations of the source device. Samsung Galaxy Tab E 9.6 SM-T561 (gtel3g) - GitHub The "gtel3g" variant of the Galaxy Tab 4 7
旧平板，三星平板SMT560/T561刷机LineageOS 14.1，再战几年 This link or copies made by others cannot be deleted
By moving from KitKat (API level 19) to Nougat (API level 25), the tablet gains access to:
community in bringing Nougat features to this 2015-era tablet. What’s Working: Core System: Booting, Touchscreen, and basic UI. Connectivity: Wi-Fi, Bluetooth, and GPS. Internal and SD card mounting. Customization: Standard LineageOS button mapping and status bar tweaks. Known Issues / Bugs: