#1 position ONLY, with new HG2001GD40 gives a fault AFTER ” ON BATT”.
OLD HG2001GC02 will run fine.
IMT on the GD40 IN #1position is “DATA INVALID”.
Other 2 units are disgustingly normal.
https://youtube.com/shorts/pxopz7Y77Fs?feature=share
#1 parity pin 4c set to ground. All good now
https://youtube.com/shorts/2Hezva5NJ3I?feature=share
Little difference between units.