Update README.md

Very useful information for configuring ESPHome component
atc1441 · Oct 13, 2020 · e3dcdbe · e3dcdbe
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@@ -131,6 +131,14 @@ Byte 17 frame packet counter
 
 0x0e, 0x16, 0x1a, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xbb, 0xcc, 0xdd, 0xdd, 0x00
 
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+## Using custom firmware with ESPHome
+The LYWSD03MMC sensors work directly with ESPHome XiaomiBLE - [xiaomi_lywsd03mmc component](https://esphome.io/components/sensor/xiaomi_ble.html#lywsd03mmc).
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+Set "Mi like" advertising on custom firmware. The bindkey is not necessary any more as the payload is not encrypted in the custom firmware. However, since the bindkey is a mandatory parameter, you still need to give it a fake one in the config file. It can be anything though, as long as it is formatted like a real one.
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+Details: https://github.com/esphome/feature-requests/issues/552#issuecomment-688049747
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 ### Stock firmware:
 Inside this .zip can be found the stock firmware to go back
 https://github.com/custom-components/sensor.mitemp_bt/files/4022697/d4135e135443ba86e403ecb2af2bf0af_upd_miaomiaoce.sensor_ht.t2.zip