i had some idea why it got that error
if you said it only happen on ms28 only
since ms25 and ms28 has the same hardware
so i think it is because of that x360sam that cause the problem
it's not the x360sam it self that cause the problem
but because it copy these address $4000-$43FF
so maybe there are different within these address that make ms25 and ms28 different
so i think ms can detect it from those address
since ms25 user dont have this e66 problem
i guess if you copy just only key from ms28 to fresh ms25 firmware (just key not whole $4000-$43FF) with kdx 1.5
and then use x360sam to combine with xtreme4.2 then flash it
it might resolve the problem
but it's all a guess
for ms28 user please try it and post the result
