Zigbee FW update should fail gracefully/fall-back unless something odd happens. I haven't had a device get bricked using the HE Zigbee FW update.
Post the logs from when you initiated the FW update - did you see log entries indicating that the FW update was in process? The hub can't update the device unless HE has received the FW update files for the device and made them available. The FW update button will be there on the Device page regardless of any FW update being available.
I don't see BTF controller or Arduro Eria bulbs listed on the HE compatible device list, so it seems unlikely that HE would have the FW update file available for those devices in that case.
