First of all, a lot of Thanks for this useful thread sir...
I am using DroidMAXX with Unlocked BL, rooted and customRecovery flashed... I can see the lines to flash boot image and recovery image. So on flashing this my phone's BL will be relocked and stock recovery will be flashed, isn't it. Later I can again unlock using the code, right? And I can use this method to receive OTA (for 4.4.2) right?