EngineerMode is still present in #OnePlus5T but the angela backdoor had been removed. The secret codes related to EngineerMode are:
*#*#818#*#*
*#*#838#*#*
*#*#7668#*#*
*#*#5646#*#*
*#*#3439#*#*
*#*#9339#*#*
*#*#3392#*#*
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