Hello,

yes i inspected hashboards physically and cleaned everting, was not dirty much but better than nothing. also one of the heatsing fall off. so how to put it back? may i use Arctic Silver 7g Premium Silver Thermal Cooling Adhesive Set (ASTA-7G) (which i used a year ago for S9) or only heatgun and basic solder?
second question, can u help me identify the chains physical position? I have J1-4J(using only J1,2,3) data cables connected to hasboard, but in system chain 0,1,2 are how related to J?
J1 is chain0, J2 is Chain1, J3 is chain2?

Is ok, if I pull only data cable from hashboard and let it still be connected to psu? ill just remove the data cable to test it with one chain at the time.

Is better to use for testing purpose original FW instead of hiveon FW i am currently running(underclock settings) so it will provide more V to the hashbaord for better stability?

thank you in advance, appreciate