If your TA identifies as 0.23, 2.00beta1, or 2.00 then use the 16bit.exe
firmware (mt201.hex and st2_read.txt).

If your TA identifies as 1.24, 1.25, 1.26, or 1.27 (anything less than 2.00)
then use the 8bit.exe firmware (127a.hex and st_read.txt).

To get the TA identification, give it the AT command "ATi1".