Crosstalk means your cable is damaged which cannot be used. So that is not the issue of switch or 901ND, the cable cannot work in any other situation. Change new cable is the method you need to do.

I attach each port for better understanding. And here i configure VLAN2,3,4 for each part you want. Then the configuration should like: VLAN2: port1,2,3; VLAN3: port4,5,6; VLAN4: port3,4,7,8,9,10;...

You could check whether your sfp port is independent port. If yes, you could double check which could see that port in VLAN settings. If not, you just configure port 9 with VLAN, it is also for sfp...

There is no way to disable it. It is just an unmanaged switch which couldn't make any change. And i cannot see any utility for this switch, where could you find it?

After you configure DHCP mode, switch would get ip address from your former router. You need to check the ip address from your router, it could not be 192.168.0.1. And i also don't suggest that let...

There is a beta firmware that i get from TP-Link support team. http://tp-link.com/resources/software/TL-EAP320v1_en_1.0.0_20160429-rel71477_up_tmp_signed.zip