If you corrupt boot0 or the U-Boot environment on eMMC, the device is hard-bricked unless you boot from an external SD card. Always keep a bootable recovery SD card handy.
: The A133 typically runs Android 10 or higher, often in "Go Edition" variants for cheaper devices with lower RAM. Reviewers note that while it is slow compared to premium chips, it handles basic tasks like web browsing, 1080p video playback, and simple 3D games smoothly. allwinner a133 firmware work