by Z3X unlock OK
today I unlocked an L720 v4.3 with MK2 modem, I flashed MDC modem and unlocked it using latest Z3X.
Steps: (Phone don't need to be rooted)
1. You have to power on the phone with micro-uart cable inserted to enable *#7284# menu and select UART->MODEM.
2. Then use *#9090# and select DM via UART...phone will reboot, then unlock it.
successful l720mk2
just flash the mdc modem type ##3424 select pda and in qualcom setting select last one and unlock with z3x .successful l720mk2 unlocked
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