There are several methods employed by DAC designers to process the incoming digital data stream and extract the audio and clocking frequency. Some designs rely on an internal clock built into one of the digital chipsets, whilst others rely on an (expensive) external clock.   The Bushmaster MKII BMII-20 Firmware simplifies the process and now transformed by the BM11-20 Firmware into an even more potent DAC.

Fitting instructions: 1. Undo the four screws at the side of the case. There are two each side. 2. Remove the top cover of the DAC. 3. Look for the chip in the socket on the PCB right behind the LEDs. 4. Use a thin flat bladed screw driver to carefully lift the chip up half way on one end then half way the other end. Then repeat the procedure. 5. Remove the new chip from the plastic holder by using a flat blade screwdriver to push the chip out of the plastic holder. 6. Remove the aluminium foil from the chip, making sure not a single piece remains stuck to the chip. 7. Make sure that you fit the chip the right way round. The writing on the two chips should be the same way round when you do the swap over. The writing goes from left to right. 8. Remove old chip and replace with new one. 9. Put the original chip in the plastic holder that the new chip came in. Then put that away safely in case you need to revert back to it. My suggestion is to sellotape it to the side of the inside of the top case. But if you do that, dispose of the aluminium foil so that it doesn't accidentally short out anything inside the DAC. 10. In case you are not sure of something, get back to me for help before continuing!  

There are several methods employed by DAC designers to process the incoming digital data stream and extract the audio and clocking frequency. Some designs rely on an internal clock built into one of the digital chipsets, whilst others rely on an (expensive) external clock.   The Bushmaster MKII BMII-20 Firmware simplifies the process and now transformed by the BM11-20 Firmware into an even more potent DAC.

Fitting instructions: 1. Undo the four screws at the side of the case. There are two each side. 2. Remove the top cover of the DAC. 3. Look for the chip in the socket on the PCB right behind the LEDs. 4. Use a thin flat bladed screw driver to carefully lift the chip up half way on one end then half way the other end. Then repeat the procedure. 5. Remove the new chip from the plastic holder by using a flat blade screwdriver to push the chip out of the plastic holder. 6. Remove the aluminium foil from the chip, making sure not a single piece remains stuck to the chip. 7. Make sure that you fit the chip the right way round. The writing on the two chips should be the same way round when you do the swap over. The writing goes from left to right. 8. Remove old chip and replace with new one. 9. Put the original chip in the plastic holder that the new chip came in. Then put that away safely in case you need to revert back to it. My suggestion is to sellotape it to the side of the inside of the top case. But if you do that, dispose of the aluminium foil so that it doesn't accidentally short out anything inside the DAC. 10. In case you are not sure of something, get back to me for help before continuing!