You may downlolad files from here...click on link to download:
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| N6VCC CodePlug | SD CART CodePlug (Requires Password) | 
| D878 N6VCC_11/13/2019.rdt |  | 
| D878 N6VCC 2-2020.rdt | |
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Click to download AT-D878 Firmware/Software update version 1.23 (this is a ZIP file); This is the latest as of July, 2021 ****If you do this FOLLOW THE INSTRUCTIONS EXACTLY****
Click to download AT-D578 Firmware/Software update version 1.14 (this is a ZIP file). This is the latest as of July, 2021. ****If you do this FOLLOW THE INSTRUCTIONS EXACTLY****