This typically indicates a mismatch between the firmware file and the hardware components (such as a different Wi-Fi chip or touchscreen digitizer driver). Verify your tablet's exact motherboard id print and seek the exact matching firmware.
Before modifying any system files, it helps to understand the underlying framework of the platform. Technical Specifications Quad-core ARM Cortex-A7 up to 1.8GHz Graphics Processing Unit Dual-core Mali-400 MP2 @ 600MHz Manufacturing Process 28nm state-of-the-art process Supported Memory DDR3, DDR3L, LPDDR3, DDR4, LPDDR4 Multimedia Capability H.265 1080p 60fps video decoding, 13MP camera ISP Standard Image Formats Single update.img file or split partition packages Critical Step: Identifying Your Tablet's Motherboard ID allwinner a50 firmware