Thanks NiLuJe, hius07 and j.p.s
I am exploring USBNet
Let me recap the whole procedure in case later someone face similar problem doing serial jailbreak for KT2 using firmware 5.11.1.1
The correct steps should be:
1) follow this
tutorial to do the serial jailbreak, do until the part 5 (will do it later if you want to install KUAL)
2) install the
hotfix
If you want to install KUAL:
3) follow the instructions of this
thread under the title
Important notice for KOA/KT3/KOA2/PW4/KT4 owners, as well as *anything* that might be running FW >= 5.9.x: to install MRPI, KUALBooklet(KUAL coplate)
4) continue doing the part 5 in step 1 to install KUAL, KUAL Helper
Cheers