[Q] JP to WW/US

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http://forum.xda-developers.com – I'm currently trying to unlock my bootloader, but encountering problems. It's a JP TF300T and I'm sick of never getting OTA from ASUS (or getting it four months down the line). I finally decided to unlock the bootloader and try a custom ROM. The issue is, it's coming up with the message 'An unknown error occurs, which may be a network connection issue, please wait and try again later', when I try to unlock the device. I have been trying again and again and again...to no avail. Can anyone tell me an easy way to change my region from JP to WW or US, without unlocking please? If not, is there any (HowTos)