fwupdate -i v7.52bt-fk-tp.pkg -f
fk-tp calibrate --rf-environment=auto
Since these units are often generic, there is no single official website. You must match the and hardware ID (e.g., ZCD-7089-6905C) exactly before proceeding to avoid "bricking" the device. Method 1: USB/SD Card Manual Flash v7.52bt-fk-tp update