This is normal behavior. PhoenixCard creates hidden boot partitions that Windows cannot read natively. To fix this when you are finished flashing your device, open PhoenixCard 4.2.5 again, select your card, and click the Format to Normal button. This will merge the partitions back into a single standard FAT32/exFAT volume.
This happens when the firmware image is corrupted or is not built for Allwinner chipsets. phoenixcard 4.2.5 download
A functional built-in SD card reader or a high-quality USB SD card adapter. This is normal behavior
