The HP-10 Programmer is as you note compatible with v1.03 revision servos. However if used with v1.04 revision servos there is a problem, in most cases all is well with the exception of the programmed parameters are realized with approxiamtely 2-3* deviation. That said I'd highly recommend sending the Programmer to Hitec Service for a free firmware update to revision v1.04.

When you turn on the Programmer, watch the display and note if a revision number is displayed subsequent to start-up.