Hi I noticed some difference between the DS160128COLED-35 shipped to me in March vs ones purchased earlier in 2014.

The old I2C sequence we use:

Start + TP + X + Y + End

Start + TT + string + NULL + End

The new I2C we use:

Start + TP + X + Y + TT + string + NULL + End

Is this correct behavior?

 The both supposed be work, just noticed, you need to wait the welcome screen showing done and then send data to moudle on newer firmware version.