First of all, please let us know S/N number at back of OTDR. Then, our engineer will send you a software to add korean language. And then, follow these steps to upgrade your OTDR,
1) connect OTDR to PC with a USB cable
2) copy upgrade software to the root of OTDR DISC
3) disconnect from PC
4) go to system -> general settings -> upgrade
5) Around 2 mins later, the OTDR will re-boot automatically
Do not turn off OTDR when updating.
