IMPORTANT NOTICE
When updating from 1.14.1 make sure there is enough available space on the device (usually, "available space" rounded to the nearest 4096 byte increment) to perform the OTA upgrade. Telnet and direct HTTP upgrades with an .bin too big will result in a bricked device. espota.py and Web Interface upgrades will issue a warning.
Make sure to only perform OTA upgrade with a properly powered device. Attempting to flash and / or use a normally AC powered device (like a Sonoff) instead powered through 3v3 may result in unexpected issues with the firmware.
Snapshot build
How to upgrade "over-the-air" aka OTA: https://github.com/xoseperez/espurna/wiki/OTA
Latest changes: https://github.com/xoseperez/espurna/compare/github250114..github250601
CHANGELOG.md: https://github.com/xoseperez/espurna/blob/33617fc/CHANGELOG.md#1210-snapshot-build-2025-06-01
Build from source
PlatformIO: https://github.com/xoseperez/espurna/wiki/PlatformIO
Arduino IDE: https://github.com/xoseperez/espurna/wiki/ArduinoIDE