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Oh my fault ... I meant MIOS. You only upload the newer MIOS version with the bootloader (which is already burned on the microchip). You don’t upload the bootloader itself!! (that's for a burner and not for midi transmission). Sorry, my confusion in the binary term - I just recognized it now. I hope you read it before trying, but however, MIOS Studio should warn you about this (range detection). from the readme.txt of mios1.9h take case A): A) you've already installed MIOS8 V1.9g, and want to update to MIOS8 V1.9h Thats the common case, you have to upload one of these files via MIDI as described on the http://www.ucapps.de/mios_bootstrap.html page depending on the PIC derivative you are using. ... PIC18F4685: -> pic18f4685\midi\mios8_v1_9h_pic18f4685.hex upload the mios1.9h hex and then you can upload the MBSIDv2 app again.

To add some more context to this topic, I’m sharing the full side-by-side comparison as an Excel doc. The BOM reference is for a complete MB-6582 build, with two sets of sourcing options (one using mostly premium components from Mouser and the other uses more economical alternatives, from the likes of AliExpress, eBay, Amazon and elsewhere). _MB 6582 BOM - Economy vs Premium Build Cost Comparison - Oct 2020.xlsx The short of it is, you can make a complete MB-6582 today for around $513 USD, when you only consider the costs for required BOM components. However your total out of pocket expenses will actually be significantly higher, because you'll need to buy in bulk to get better volume prices (e.g., closer to $1,127 USD). This obviously means that after the build, you’ll have plenty of spares sitting around for your next build or another project. For a premium build, which uses real SIDs (8580 R5s), panels from FPE / Shaeffer and components sourced mostly through Mouser, your BOM will run closer to $1,221 USD. In this case, out of pocket expenses would come in closer to $1,661 USD, which means you'll still have plenty of spare parts left over, but far fewer than with the more economic option above. There are obviously many other sourcing and bulk volume options that can be considered and all of them would have an impact on these numbers, so consider this to be some type of rough guidance. Hope you find it as useful as I did when planning your own build(s)... Cheers, -Darrell