Several months ago I rooted by Nexus 6 XT1103 with Nexus Root Toolkit V2.1.5. I just tried to unroot my unlocked phone but it is now caught in a bootloop. I followed the Full Driver Installation Guide – Automatic + Manual setup and had a successful Full Driver Test. My attempt to unroot my phone I used Flash Stock + Unroot, Device is on/Normal. I selected my build, MMB29K, did Automatic download in No Wipe Mode. Once the download was complete my phone restarted and was stuck in bootlooping. NRT timed out after 20 minutes. I followed the Bootlooping fix instructions and did wipe data/factory reset to no avail. Next I re-attempted Flash Stock + Unroot Soft-Bricked/Bootloop. I re-download the MMB29K build in case I download the wrong package previously but this time I did not use No Wipe Mode. Same result. I have redone this process several times with no success. I even wiped the cache partition. I’m not sure where to go from here. Can I flash an earlier build than is currently installed on my phone?