Now, though, the MM update keeps crashing my phone. It will sometimes maintain stable operation for 20 minutes, but it will eventually crash and reboot. I once got the mmc_read_failed error on a reboot, but I am not completely sure what is causing the issue. The phone worked fine until the OTA update installed. After that point, it crashed once while setting up my Google account and has been crashing regularly ever since.
What's the best way to fix this? Are there any good Marshmallow updates I can install, either rooted or stock. Also, any I can use Odin for?