Regarding how to correctly connect the JK inverter BMS to the inverter, this table can help you

This page shows you the communication methods and protocols between JK Inverter BMS and its compatible inverters, helping you solve some problems on how to connect your DIY battery to the inverter.

Let's take how the JK BMS is connected to the EG4 inverter as an example:

First you need to open the JK BMS app on your phone and connect to your battery.

Select the Pylontech communication protocol in the communication protocol in the picture below and save it.

Then you can connect your battery to the inverter according to the normal steps.