Reading firmware out of a mask ROM microcontroller

[cilione]

I'm trying to dump the flash of a M16C/65.
I've successfully read out everything except block A + B, these are being read as FFs.
I guess that block A + B has to be enabled?

m16c-flasher returns "VER.1.00"

I guess that the code provided for enabling A + B has to be adapted for this MCU?


M16C/65 Group
User’s Manual: Hardware
https://www.renesas.com/en/document/mah/m16c65-group-users-manual-hardware?r=1053261