If a firmware update fails, try to turn the Bulb off manually with a light switch or unplug it. Then turn the bulb back on and check out the firmware version via the Wyze app. To do this, go to the Account tab and tap Firmware Upgrade. Here you will be able to see if you have the newest version.
If it is not the latest version, try to update the firmware for the individual device or use the Upgrade All button on the bottom.