Click the button, browse your filesystem, and select your target Allwinner .img firmware file.
Includes a "Restore" button that formats the MicroSD card back to its original FAT32 state, reclaiming the hidden partitions created during the burning process. phoenixcard v4.1.2
References & further reading
For users not on Windows, the official tool is not an option. Here are some alternatives to consider. Click the button, browse your filesystem, and select