You can try to remove again the ess nvm pwb, remove battery, be sure the batt voltage = 3 - 3.2 volts,
put all back and try again the serial procedure.
If dont work then the litlle ess nvm board is defective and you must replace it with new one.
With the new electric board you must do same gp4 procedure because there is no serial on new board.
I need this things please send me email. okiccopy@gmail.com
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