Update E1812.md (Koenkk#1748)

Added section for troubleshooting OTA. OTA works for me, after following this troubleshooting info (see also Ikea E1743).
7IM3rW · Dec 7, 2022 · abfcaee · abfcaee
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diff --git a/docs/devices/E1812.md b/docs/devices/E1812.md
@@ -31,6 +31,9 @@ Pair the remote to Zigbee2MQTT by holding it close to the coordinator and
 pressing the inside button, next to the CR2032 battery, 4 times.
 The red light on the (front of the) remote will now flash a few times.
 
+### Troubleshooting: Device didn't respond to OTA request
+To resolve the `Device didn't respond to OTA request` error, you can try to push a button on it, shortly before you start the update, to wake up the Remote.
+
 ### Binding
 The [binding](../guide/usage/binding.md) functionallity of this remote varies per firmware version:
 - below 2.3.75: suppports binding to groups only. It can only be bound to 1 group at a time. By default this remote is bound to the default bind group which you first have to unbind it from. This can be done by sending to `zigbee2mqtt/bridge/request/device/unbind` payload `{"from": "DEVICE_FRIENDLY_NAME", "to": "default_bind_group"}`. Wake up the device right before sending the commands by pressing a button on it.