Hi. I was trying to change hotend of ultimaker 2 to e3d v6 but it went horrible wrong. I would like to get some feedback what possible went wrong and what can I do right next time. Guide I used is this: http://wiki.e3d-online.com/wiki/E3D-v6_on_Ultimaker_2 My first problem was that ultimaker was unable to read new heat sensor. So I uploaded .hex but problem persisted. So I connected ultimaker to computer and uploaded marlin. Still ultimaker was unable to read heat sensor so I called it a day and went to sleep. Next day I studied a bit and noticed heat sensor was 100k so I figured out my error was using wrong settings. So I changed settings and connected again but windows told me board is malfunctioned. A bit baffled I studied case and indeed board was going strange. It longer was not able to read z switch (I had to press it multiple times). I checked all cables but everything is correctly connected. So my question is can firmware update break ultimaker 2 board? All files I used were from that guide. Another incident which may break board was that I connected power cable to board when power switch was on. But it should not be that fragile. Im not really angry about broken board, you can buy a new from China with 70£, but I want to understand what went wrong and what I can do better next time, and the most important: does that guide have errors. Thank you for replies.