I have flashed the Android M developer preview 3 on my Nexus 5 phone, for which I was required to unlock the bootloader. Now that the flashing has completed successfully, should I re-lock my bootloader? I had seen threads on xda siting that phones could get into boot-loop if bootloader is locked after flashing. I have no custom recoveries installed or the system is "as is" received from google. So do I relock or will it soft brick my phone? I am only a noob. Please be detailed.