USB seems disconnected during loading system to note 8 n5110 and as a result, it stocks at "Firmware upgrade encourtered an issue. Please select recovery mode in Kies and try again". It showed no response to power key and home key. Is there any hope to reload the boot and related files to the device again for unbrick and how? Thanks a lot.
Just curious but how are you turning it on? Physically connecting the battery?
Make sure you have the Samsung device driver installed on the PC. Also might try it on another PC if you have that option and see if Odin can connect to device.
If Odin will not work might try using Heimdall: http://forum.xda-developers.com/showthread.php?t=755265
As I said, I cannot turn it on or off. It is on when it has power. Yes, you are right, the battery is solided on the device, so I cannot take the battery off.
I have samsung decive driver installed on my PC. Without going into download mode, the PC and Odin at least can find the device, although PC only recognized it as a moderm.