Hello Everybody! this is my first post so first of all - many thanks, Thorsten, for your great job on MIDIBoxes. Also - hi to everyone in this friendly and helpful forum. Now back to my issue - I'm having problems with SIDv2 software upload. Here is what I do and what I get: 1. I have PIC18F4685 with the latest bootloader (v1.2b). 2. I successfully upload the latest MIOS to PIC using MIOS Studio (beta7.5). After upload core/PIC reboots, LCD displays welcome screen with MIOS version (v1.9f) and then "READY.". 3. After this I try to upload SIDv2 software (successfully compiled v2_0_rc25). Everything goes fine until these addresses - Sending block 0000FF00-0000FFFF Received Checksum: 17 - OK And then I get - Sending block 00010000-000100FF Received error code 04: Write failed (verify error or invalid address) Sending block 00010000-000100FF Received error code 04: Write failed (verify error or invalid address) and so on, until - Sending block 00010000-000100FF Received error code 04: Write failed (verify error or invalid address) Aborting after 16 errors So, it seems like I can't upload anything to the addresses above #FFFF. I tried to find the similar upload problems in forum, but all they seem to be different (either error codes, or addresses, etc). What am I doing wrong? Any help is much appreciated. Best, Saulius