Device won't power up after kernel flash

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http://forum.xda-developers.com – Had a SGS2 I9100-G, Gingerbread 2.3.5, XXKI4. 1)Tried to flash ICS RR, rebooted, stuck at SAMSUNG LOGO + Exclamation mark; 2)Tried to flash STOCK ROM, got NAND error in Odin, PC - ! - Phone logo shows up; 3)Flashed the GINGERBREAD VERSION kernel from [GUIDE] Fix an unflashable or soft bricked GSII (I9100G/M/P/T VERSION INCLUDED!), rebooted, now the SAMSUNG LOGO + Exclamation mark shows up again; 4)Tried to flash Lightning ROM, Odin failed after writing a while, PC - ! - Phone logo shows up again; 5)Did step 3 again; 6)Tried to flash the Recovery Package/ROM from [GUIDE] Fix an unflas (HowTos)