Update from the web page (System → Firmware update → Check for an update), from the web installer, or with the <board>-ota.bin file of your board below. Card 1.0.27 goes with it.
ESP32-C6 with a 4 MB flash (#628): the C6 image was built for the 8 MB of the DevKitC-1 board definition, and a C6 module with 4 MB (ESP32-C6-WROOM-1-N4) stopped at the flash probe with a reboot loop right after the web install. The image is now built for 4 MB, which runs on both. Nothing changes for the other boards: beta.21 is beta.20 plus this fix.
From beta.20: the daily update check with its Home Assistant update entity, use without a broker, the 100 W pump default, three phases as 3 × the phase voltage, the backup heater in the estimate, the ECH2O mixed water.