Dump the full firmware via FWDN tool before attempting any repair. These board-specific builds (PUZHI W01 + FT5206 + W70) are not available online – you hold the only copy.
: The presence of upd at the end suggests the possibility that this string identifies an update package for a device, specifying which components or versions are being updated to. wm8850 mid7 puzhi w01 8223 ft5206 w70 wmc15797z upd
Your SD card might not be compatible. Try a different, older card (non-SDHC if possible). Dump the full firmware via FWDN tool before