Update OTA troubleshooting tips based on feedback.

Update OTA troubleshooting tips based on feedback.

source/_integrations/zha.markdown

@@ -585,11 +585,13 @@ Since all Zigbee Coordinator radio adapters are very sensitive/susceptible to al
 
 ### Problems upgrading Zigbee device firmware via OTA
 
-Be aware that OTAU (Over-The-Air Upgrade) of Zigbee devices typically takes around 10 minutes. While a device is updating a lot of traffic is generated on the network, therefore it is recommended to not execute multiple updates at the same time. Always check that battery-powered devices have at least 70% of battery-life left before starting a firmware upgrade (a general tip is therefore to simply put new fresh batteries in before upgrading any OTA firmware upgrade), OTA updating of firmware is very power-consuming and while some devices do check for a minimum battery-level before starting the upgrade and might refuse to update unless have enough battery-life left, not all do so.
+General tip before upgrading any OTA firmware upgrade is to simply put new fresh batteries in the device, (OTA updating of firmware is very power-consuming and while some devices do check for a minimum battery-level before starting the upgrade and might refuse to start the update process unless it has enough battery-life left, which not all device firmware do.
 
-If Zigbee firmware upgrades do not start on a battery-powered product, then be aware that you usually need to "wake up the device" so that it will be able to receive commands (because battery-powered products are sleepy devices, so they normally only receive commands when the state of the device is changed). If the upgrade still does not start, then try restarting the device by disconnecting the power/battery for a few seconds and try again; make sure to activate the device by 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 until you see the first "Updating... " message in the user interface.
+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 are 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 they are askeep and only receive commands when the state of the device is changed.
 
-Another common reason for Zigbee firmware upgrades not starting or 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.
+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.
+
+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.
 
 ### Zigbee network visualization in ZHA UI