Which protocol should I use in sending a bin file to EC20

I am trying to update the firmware of MCU Over the Air. So I would like to know which protocol should I use to transfer the binary files.
Is there a Ymodem protocol in EC20?

Hello sir, thanks for your question
You can use FTP and HTTP(S) protocols to transfer binary files
In addition, EC20 does not support Ymodem protocol, please know, thank you.