I dirty flashed over 10-21-15, after wiping cache and dalvik, got bootloops at the "optimizing apps" dialog box. Luckily I was able to dirty flash 10-21-15 over this and got it to boot up again. Tried flashing 11-21-15 again without clearing cache and dalvik but got the same result. Any idea what would cause this? I ended up dirty flashing 10-21-15 and got everything working again.
I had this happen to me during the last update with a dirty flash. Mine had about 60 apps left to optimize and then began to bootloop. I attributed it to overheating. I put the phone in the fridge and optimized completed YMMV.
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