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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*#*#818#*#* : send a broadcast with the action "http://com.android .engineeringmode.NetworkSearch_New" and extra called "Step_Num" set to "Third" *#*#838#*#* : same with extra set to "Fourth"
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