File version is too low

I try to update the Nextion using the lib ESPNexupload.
I do some moodification and finnaly I am able to send bytes in the display.
The display write the message “File version is too low”
What’s append ? Is somebody can help me about ?
Is the problem occurs because it the lib use the old protocol “whmi-wri”

Many thanks for your help.

Best regards