Home Assistant Voice has the firmwares here: Releases · esphome/home-assistant-voice-pe · GitHub
I know I can flash through the web interface. However, I want to flash via USB or via UART, locally, by downloading the release from github.
If you are starting from an ESPHome YAML config, just use ESPHome - Getting Started.
If you just want to flash a binary use ESPTool.
There are likely some apps that provide a UI for ESPTool, but the ones I used prior to switching fully to ESPHome are all basically defunct.
install esphome device builder. you may compile yaml locally. it allow local flash over wifi. install over usb require valid https. HAVPE should be autodiscovered and allow you to “take control”
There is also command line install using esphome but i am not using or familiar with it.