My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
You will need to get past the flashboot screen, it is tricky with the Droid Maxx. It may take several tries to get it right.
Please let me know if this does not work or if you need any other assistance.
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Thank you very much!