Update source/_integrations/zha.markdown

Co-authored-by: Copilot <[email protected]>

Author: Hedda

source/_integrations/zha.markdown

@@ -789,7 +789,7 @@ Before upgrading any OTA firmware, it is recommended to install fresh batteries
 
 If Zigbee firmware upgrades do not start on a Zigbee End Device (i.e. a battery-powered product), then note that you usually need to "wake up the device" (e.g. trigger state change or pressing a button if available) so that the device becomes awake and is thus able to receive commands to start the OTA upgrade. The reason for this is that battery-powered products are so called "sleepy devices," so they normally are asleep and only receive commands when the state of the device is changed.
 
-If the upgrade still does not start, then try manually restarting the device by disconnecting the power/battery for a few seconds and try again; then again make sure to activate the device by triggering state change or pressing a button on it right before sending the update request. Try to push a button on the device (if it has one) shortly before you start the firmware update to wake it up. Sometimes, it also helps to try keeping the device awake by repeatedly pushing a button pr triggering state change until you see the first "Updating... " message in the user interface.
+If the upgrade still does not start, then try manually restarting the device by disconnecting the power/battery for a few seconds and try again; then again make sure to activate the device by triggering state change or pressing a button on it right before sending the update request. Sometimes, it also helps to try keeping the device awake by repeatedly pushing a button or triggering state change until you see the first "Updating... " message in the user interface.
 
 Be aware that OTAU (Over-The-Air Upgrade) of Zigbee devices typically takes around 10 minutes per device, if it takes longer then another common reason for Zigbee firmware upgrades not starting, taking a very long time, or even failing, is poor reception or not having a stable Zigbee network mesh. Take action to try to optimize your Zigbee network by avoiding radio frequency interference and adding many Zigbee Router devices (repeaters/extenders) to extend range and coverage. Try to follow all the best practice tips above in the [Zigbee interference avoidance and network range/coverage optimization)](#zigbee-interference-avoidance-and-network-rangecoverage-optimization) section under troubleshooting.