Hi,
I seem to have the same problem.
I just built a 18f452 pic core and I am trying to upload MIOS.
In MIOS Studio 2.3.1 I see the following message:
Operating System: MIOS8
Board: MBHP_CORE or similar
Core family: PIC18f
Bootloader is up & running!
Then I try to upload mios_v1_9g_pic18f452.hex
Before, during and after the upload, the MIDI IN box shows uploads requests.
After the upload, without any errors, I still see Bootloader is up and running!
How can I get MIOS into the PIC?