Is this it? i found it on google. http://chomikuj.pl/Koozbi/LG+L9+(p760)/(-LG+P760-)/Romy/V10H_00,3688368508.kdz
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You should be able to but after you flash the kdz you are going to need to perform a factory reset by the vol - key, the home key and the power key for it to boot
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I installed v10h with LG Flash Tool 2014 then received updates on firmware v20b -> v20c -> v20h by OTA
Normal process?
There is no way to relock the bootloader
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There is no way to hide it sorry
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Idk what you mean but the only gsmzone i could find does sim unlock not bootloader unlock. There is no way for an outside service to hide/lock/unlock/block bootloader
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