Most A23 tablets cannot run modern Android (beyond 4.4 KitKat) due to kernel 3.4 limitations.
# Install sunxi-tools sudo apt install sunxi-tools allwinner a23 firmware
Firmware for the A23 is not a single file—it’s a collection of partitions, bootloaders, and system images packed into a format understood by Allwinner’s / PhoenixSuit tools. Most A23 tablets cannot run modern Android (beyond 4