Unlike standard imaging tools like Rufus or Win32DiskImager, which deploy typical disk sector files ( .img / .dd ), PhoenixCard processes proprietary Allwinner .img packages. It doesn't just copy files; it sets up unique boot sectors and hidden instruction sets ( boot0 / uboot ) that Allwinner hardware chips look for immediately upon powering on.
The software can write to any USB drive, so ensure you select the correct drive letter to avoid data loss on other drives. To help you further, I need to know: What is the exact device model you are trying to flash? Are you getting a specific error message ? What is the file extension of the firmware? phoenixcard v412 work