Default [HELP]How to Flash U-Xboot via terminal ??

How to Flash U-Xboot via terminal
can anyone answer me??
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LG OPTIMUS l9 P769
LOCKED BOOTLOADER
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OVERCLOCK @ 1200MHz

SAMSUNG GALAXY MINI GT-S5570B
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ROM :[ROM][PORT][CM9.2][v5.1]Touchwiz Revolutionised 5
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