Hi. I'm trying to build MidiBox SEQ V4 and I am confused with MIOS. Could anyone help me to understand what am I doing wrong with it? So, I got my STM32 F4 (it says STM32F407VGT6 on the chip) connected it via ST-LINK and succesfully uploaded the mios32_bootloader_v1_018/MBHP_CORE_STM32F4/project.hex on it with STM ST-LINK utility using SWD port. To be sure, I compared the .hex vs. board memory with the same utility and no differences was found. At this stage if i connect MIDI_IO to core, connect USB cable to CN5 of STM32F4, start MIOS studio without pressing any buttons and select SB X-FI MIDI port for MIDI IN and MIDI OUT and hitting RESET I get on the lower text field: [10869.030] ==================== [10869.039] Bootloader 1.018 [10869.049] ==================== [10869.052] [10869.063] Checking Bootloader... [10869.340] No mismatches found. [10869.353] The bootloader is up-to-date! [10869.369] You can upload another application now! [10869.390] Or type 'help' in MIOS Terminal for additional options! I connected second USB cable to CN5 and while holding down blue USER I pressed black RESET button.( From now on I keep BLUE button held down.) Now, when I start MIOS studio 2.4.6 to upload the actual sequencer program and select "MIOS 32 Bootloader" for MIDI IN and MIDI OUT, I get: Operating System: MIOS32 Board: STM32F4DISCOVERY Core Family: STM32F4xx Chip ID: 0x10016413 Serial: #320025000347333234333738 Flash Memory Size: 1048576 bytes RAM Size: 196608 bytes MIOS32 Bootloader (c) 2014 T. Klose I select BROWSE and open midibox_seq_v4_089/MBHP_CORE_STM32F4/project.hex and get: Reading project.hex project.hex contains 393288 bytes (1537 blocks). Range 0x08000000-0x08003fff (16384 bytes) - BL excluded Range 0x08004000-0x080041ff (512 bytes) - STM32 Flash Range 0x08010000-0x0806beff (376576 bytes) - STM32 Flash Press start button to begin upload. By pressing start i get: Upload of 377088 bytes completed after 7.99s (46.08 kb/s) 1 ignorable errors during upload solved (no issue!) then the board resets and i get exactly same text on left screen as above. Questions: Should i see at this point or after resetting the board something else on left text area of MIOS studio or on LCD if I hook up it up? (LCD stays blank. Only backlight is on) Why if I get back to the ST-LINK utility and compare .hex vs memory I get: Error. 1st difference found @: 0x8004004 ? Looks to me that application is overwriting part of the bootloader. Still the bootloader seems to work? What is that 1 ignoreable error? Is there some kind of logfile that MIOS studio writes? Tried all above with GM5 driver also. Result are the same. Using Windows 7 ultimate 64bit.