HELP PLEASE HOW TO ENTER THE MODE Mask ROM Mode Short THANKS
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Hmmmmmmmmm
You sure is s905X3
FRom first image/underside in center of board is a cluster of 5 copper colored test points/ and just below on right is a single
Test to Gnd one at a time
Below and to the left are 2 concentric test points
And in bottom left corner is
GND
TX
RX
Vcc
For serial
Second image
Center of Board to the left of lettering E328532 is 2 copper colored test points/maybe bridge them
In bottom left you will see Serial again Barcode sticker is probly covering up lettering on board
Good Luck
Happy Testing
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