I have an unlocked/rooted Nexus 7 (2013) running 6.0.0 (mra58u). I want to update to the latest build (mra58v). I have been using NRT but the latest version 2.06 has a bug that doesn't recognize the unlock state of the bootloader (http://www.wugfresh.com/forums/thread/nexus-7-2013-boot-lock-status-issue/). So I thought I would do this manually. I don't want to wipe the data. I have all the .img files. The question is do I need to flash the bootloader or just the system.img, boot.img, recovery.img, & cache.img? I've read the thread on doing a manual update but I'm not clear about this. Obviously, I'm a nube, so any other advice would be welcome.