Asus started rolling out Stock Android 6.0 Marshmallow update with build number WW-18.104.22.168 for Asus Zenfone Zoom ZX551ML. Most of the users have already received the update notification and successfully updated their devices on latest firmware and also shared screenshots. The Stock Marshmallow firmware for Asus Zenfone Zoom is based on Android 6.0 Marshmallow and brought all new interface with multiple improvements and improved security patches.
The Marshmallow WW-22.214.171.124 firmware for Zenfone Zoom is rolling out via OTA but if you wish to manually update your device on Stock Android 6.0 Marshmallow via stock recovery then just grab the firmware from the below provided links and install it via Stock recovery.
Update WW-126.96.36.199 Stock Android 6.0 Marshmallow on Asus Zenfone Zoom ZX551ML via OTA
To update Asus Zenfone Zoom ZX551ML on Android 6.0 Marshmallow firmware you don’t need to download multiple file for it, just you need your device and the working internet connection. You must also remember that OTA process works only on Stock devices which means your device is no longer rooted while you searching for latest firmware via OTA. If you think your device is rooted then don’t waste your time switch to alternative firmware update processes or if possible un-root it and then give it a try. But we don’t recommend you to get stuck in such a long un-rooting process just manually if the download link is available. If you think you are all set to go, then
Go to device Settings >> tap on About device >> Software updates.
Now tap it to check the latest available firmware. Upon it’s availability you will be prompted about the update, now what just tap “Download Now” to instantly download the firmware or “Download later” if you wish to download later. Some times it depends on the region too for example, if the update is released for a specific region but you are not present there it will take some delay until firmware update reaches that region.
Download Stock Android 6.0 Marshmallow firmware for Asus Zenfone Zoom ZX551ML: Download [WW-188.8.131.52]
Toss the above file on your device and flash it via stock recovery. Please let us know if you have successfully updated your device.