Product:	JDS Labs EL DAC II+
Firmware:	v2.1.2
Filename:	el_dac_ii_plus_v2.1.2-upgrade.bin 
MD5 hash:	2e266fd73695bff78c30e18ee50139712c7deaad


# GENERAL INFORMATION
- A direct connection to a USB 2.0/3.0 port is required. USB hubs and some Type C or USB 3.1 ports may prevent DFU communication.
- Only connect one (1) JDS Labs DAC at a time.
- EL DAC II+ will automatically restart upon completion.
  In the rare event that an update fails, it is safe to power cycle your EL DAC II+. The DAC will fallback to previous firmware.

# WARNING
The Device Firmware Update (DFU) tools only check for a valid JDS Labs USB Vendor and Product ID before loading firmware to your DAC. 
The update tools do *not* check the .bin file you supply, nor can they check that the DAC matches the .bin file you provide. 
Thus, please triple check that you are loading the right firmware for the right model!

If you accidentally load firmware for the wrong JDS Labs DAC, you can likely recover by flashing the intended firmware. 
If not, please reach out to jdslabs.com/support

# WINDOWS 10/11 INSTALLATION
Please use the latest XMOS Driver and XMOS Firmware Update Utility (DFU) found at:
https://jdslabs.com/support/drivers/


# MAC OR LINUX INSTALLATION
Please refer to:
https://github.com/jdslabs/xmos_dfu

Additional detail and installation guidance for all operating systems can be found at:
https://blog.jdslabs.com/2020/08/custom-firmware-builds-for-element-ii-el-dac-ii-and-atom-dac/#installation-info


# CHANGELOG
## v2.1.2 (09-Nov-2022)
* Mute output when USB audio is inactive, to prevent unexpected sounds from Linux or Android systems

## v2.1.0 (23-Feb-2022)
* Updated core XUD, USB, and I2C libraries
* Move to RAM based-settings developed for Element III
* Enforce de-emphasis OFF in USB mode, and Auto de-emphasis in S/PDIF mode
* Improved error handling when USB Host is in standby
* Faster mode switching
* Changed default DPLL from 5 to 7 to improve general compatibility with 4k TVs
* Improved UAC1 Descriptors to support Nintendo Switch
* Disable operating system volume controls by default: Support PS4/PS5

## 1.A.1: Final THD+N Tuning; updated USB VID/PID Assignment.

## 1.A.0: Initial release