How do I unbrick an LG Optimus 3DCube?

A

AC Question

How to unbrick an LG Optimus 3DCube

Hello, I have a korean LG optimus 3d cube su870. My friend bought the phone in Korea, and he brought it to the US. He tried downloading a new software on it, and it crashed and now I believe it is "soft bricked". When I try to turn it on, only the LG logo appears for about 1 second, and then it turns off again. I cannot get it to go into recovery mode or download mode. If anyone has any idea what I should do to get it working again, please let me know
 

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