Stuck at the step of using sftool to flash firmware while reproducing the LCSC AI Training Camp project

While reproducing the LCSC AI Training Camp project, I got stuck at the step of flashing firmware using sftool.

LCSC AI (Plugin Version): https://lceda002.feishu.cn/wiki/B2LLwyC7binHuJkkHGMce03wnWf?from=from_copylink

Multimeter shows no current between BAT and VSYS.

Have you used it with a battery?