Coreelec in Amlogic X96 max Plus S905X3

I got 2 questions regarding X96 max plus (s905x3 4gb-1gbit lan):

1 - when I choose to use “sm1_s905x3_4g_1gbit.dtb” the box doesn’t boot up but just freezes, but when I use “sm1_s905x3_4g.dtb” it works with a slight problem that I don’t get full 1gbit lan.

2 - S905x3 has 4x 1,8ghz processor, when coreelec is running, I am getting 1ghz with 1 core working and sometimes if restart, I manage to get 2 cores running on 1,2ghz. How can I get all cores working?
Coreelec hardware/CPU governor setting is set to Performance.