My problem is that I can't go on download mode. I've tried all button combination described (vol. up + down + plug USB / remove battery, vol up+down+ plug USB + put battery...) but every time, the phone's just booting and stuck again on "LG Security Error".
I can only boot to "LG Service mode".
I tried command via adb (adb reboot download, adb reboot-bootloader) but same thing, phone booting and stuck on "LG Security Error".
I tried adb reboot recovery, it just do hard reset but don't solve the problem.
So does anyone can give me more ideas? What should I do? Is there another way to boot in download mode? Or is it possible to flash via adb?
Thank's for your help guys.