Dear Cloud,
Please click the following link to download the latest firmware of EC20CEFDGR06A07M2G. Thanks!
https://cnquectel-my.sharepoint.com/:u:/g/personal/asean-fae_quectel_com/EYI8JxIUN5ZGlUJWXoknJ0QB5KjTzfbqbO7Nb8-NDebZqg?e=eUzAAL
About specification, you can check the EC20 R2.1 spec. Please note that this module is used for domestic marketing in China, not for oversea marketing. Thanks!