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SUCCESS! My hunch panned out... So now I have all cores working properly, with the correct Device ID's... Once again, in the end the process was simple and straight forward, but easy enough to get confused with... For anyone that's interested in a step-by-step guide, here's what I did... Step 1: Write the basic bootloader to all 4 of your PICs Step 2: Place the PIC that will become the Master Core 1 into the correct Socket, launch MIOS on your computer and access it as Device 0 Step 3: Now you'll use MIOS to write the MIOS OS hex, followed by the setup_mb6582 hex. (more info for steps 1-3 here: (http://midibox.org/forums/topic/21324-change-pic-id-using-a-mac-for-mb-6582-core-0/#comment-186254) Step 4: Once you're done with Core 1, you can test your control surface navigation, listen to the default patch sound, etc... Step 5: At this stage I chose to remove Core 1. I didn't want MIOS to be confused when I added in Core 2, which will have the same Device ID 0 (not sure if this step was necessary though?) Step 6: Place the first Slave, Core 2, into its proper destination socket. You'll need to move the J11 jumper to position 2 to enable MIDI out to come from Core 2. You'll also need to move the LCD cable to J15_CORE2 so you can watch the screen through each update phase Step 7: Power up your MB-6582, MIOS should see Core 2 as Device ID 0 now. You'll change Core 2 to become Device ID 1 by using MIOS to write the 'device_id_01.hex' file that comes bundled with 'change_id_v1_9g.zip' (available in the troubleshooting section http://www.ucapps.de/mios_download.html) Step 8: Your device should reboot after you've written the device_id_01.hex. When it comes back online your LCD should show "New ID Header: 0000000000000001" - you've done it! MIOS should see Core 2 as Device ID 1 now Step 9: Go ahead and write the MIOS OS and setup _mb6582 hex files, to device ID 1, just as you did for the Master Core 1 ...Now you'll basically be repeating Steps 6-9 for each of the remaining Slave Cores... Step 10: Power down your MB-6582 and add Core 3 into its proper destination socket. Move J11 to position 3 and the LCD cable to J15_CORE3 Step 11: Power up and do the same as Step 6, using MIOS with Device ID 0, you're ready to change Core 3 to become Device ID 2. Write the 'device_id_02.hex' file you downloaded with the change_id package Step 12: When your device finishes rebooting, your LCD should show "New ID Header: 0000000000000002" and MIOS should see Core 3 as Device ID 2 Step 13. Go ahead and write the MIOS OS and setup mb_6582 hex files Step 14: Power down your MB-6582 again, add Core 4 into the proper destination socket, move J11 to position 4 and the LCD cable to J15_CORE4 Step 15: Power up and do the same as Step 6, using MIOS with Device ID 0, you're ready to change Core 4 to Device ID 3. Write the 'device_id_03.hex' file you downloaded with the change_id package Step 16: When your device finishes rebooting, your LCD should show "New ID Header: 0000000000000003" and MIOS should see Core 4 as Device ID 3 Step 17: Go ahead and write the MIOS OS and setup mb_6582 hex files Step 18: Power down your MB-6582, add Core 1 back into its lonely socket, move J11 to position 1 and the LCD cable to it's permanent home on J15_CORE1 That's it.. When you power back up you should have a full set of Master and Slave cores with all the correct Device IDs! Moving forward, you'll never need to physically touch the cores and jumpers again to update the firmware. You can simply write new firmware to Core 1 (Device ID 0), then reboot while holding down the menu button, to automatically clone to all slave cores (magic!). Word Doc with full procedure here for offline reading: https://1drv.ms/w/s!AtmSvwylfFJaggnN1TtalEzGQK1C?e=D6UJrH Cheers!