I am debugging KL03Z16VTG4 boards (original hardware) using the KDS3.2 and PE ML-UNIVERSAL.
Among the first, they are working correctly, after a while their security is locked, no longer respond to Mass Erase.
The VDD have been supplied 2.90V.
Before the operation becomes incorrect, address 0x400 had written ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, fe, 3b, ff, ff.
I examined the MDM-AP in a different means (J-LINK).
as a result
I've set the "Flash Mass Erase in Progress" bit, but it was not cleared.
Meanwhile MDM-AP Status continues returns 0x36 (System Security = 1, Mass Erase Enable = 1).
I have a question.
In addition to the "Mass Erase Enable", or there is a factor that blocks Mass Erase?