How do you increase the buffer size?

i am using hdfreaks firmware with zgemma i55 to watch iptv using xtream-editor plugin.

i have the same setup with zgemma 2s and H2S with no problems. However with the i55 HD streams are freezing. Internet connection is fine. The buffer size on my other two zgemmas is reported as 80, but in the i55 it is 0. How can I increase it?

many thanks in advance

Thank you for your reply.
so do I have to download a plugin called serviceapp? Or is service app a setting that I need to edit within the folders in the root of the receiver?