This usually means the loader version is incompatible with your specific firmware version.
When a Nokia 1.4 is connected to a PC in EDL mode, the flashing process using a tool like QFIL (Qualcomm Flash Image Loader) proceeds as follows:
via the recovery menu (accessible by specific button combinations during startup) is the standard "non-loader" path to recovery. If you're stuck, checking specialized community forums like Bananahackers
: If you have the full firmware, check the folder for a file starting with prog_emmc_firehose