because the internal Cardtool API changes.

A: Usually, no. “Load cardtool failed” happens before the tool even contacts the SD card. It is a software initialization error.

If your firmware is a PhoenixCard-specific .img (non-raw, containing special partitioning table only understood by PhoenixCard), alternative tools will produce a non-bootable card. In that case, you must fix PhoenixCard. The Ultimate Diagnostic Checklist Before giving up, tick each box:

PhoenixCard_CLI.exe -burn -image "path\to\firmware.img" -device F: -format If you have spent an hour on the above steps and PhoenixCard still refuses to cooperate, ask yourself: Do you absolutely need PhoenixCard?