Every ZIP file in this folder contains a certain version of pre-built Adafruit nRF52 bootloader for LilyGO T-Echo board.
There are few files inside the archive. Use case of each one is determined by it's name suffix.
| Suffix | Notes |
|---|---|
| s140_6.1.1.hex | use this file for initial (factory) T-Echo programming over SWD. It contains both the bootloader and SoftDevice |
| s140_6.1.1.zip | it is useful for the bootloader and SD upgrade by adafruit-nrfutil (over USB CDC) or BLE OTA update methods |
| nosd.uf2 | for 'drag-and-drop' upgrade of the bootloader only by USB Mass Storage update method |