Android knock code analysis

My collegue she forgot the knock code and ask me for help. I know her phone is LG G3 D855 with Android Lillipop 5.0. I rooted her phone and installed some Apps for her several months ago...She said she tried all possible combination but in vain. Fortunately her phone is rooted, I told her I will tried to crack the knock code as soon as possible.

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Thanks to God..I installed SSH droid on her phone several months ago for test and of course it had connected my Wifi AP before. When I tured her phone on and found it‘s ip address on my AP. So I used putty to logon to her phone, and typed bash command to find where the knock code configuration file is. Fortunately I found the combination in the file: knockcode_pref.xml.

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The combination is "11442233", and I knew the knock code area is as below. So I told her the correct combination of knock code. She could use her phone now...

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