Update E1766.md (Koenkk#1618)

* Update E1766.md

Added comments about ota needed to launch correctly the upgrade for IKEA E1766.

* Update E1766.md

Co-authored-by: Koen Kanters <[email protected]>

Author: eladiogalvez

docs/devices/E1766.md

@@ -49,12 +49,14 @@ When connected, the light turns off.
 The [binding](../guide/usage/binding.md) functionallity of this remote varies per firmware version:
 - below 2.3.075: 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.
 - 2.3.075 and greater: supports binding to devices only
+
+### Starting OTA updates
+Press the button on it right before hitting the update button in Z2MA, and again every second or two for about 5 seconds until upgrade begin.
 <!-- Notes END: Do not edit below this line -->
 
 ## OTA updates
 This device supports OTA updates, for more information see [OTA updates](../guide/usage/ota_updates.md).
 
-
 ## Options
 *[How to use device type specific configuration](../guide/configuration/devices-groups.md#specific-device-options)*