I use nRF Toolbox 4.4.1 on iOS
to upload https://lab.ruuvi.com/distribution-packages/20170418-ruuvi_fw.zip
to the newly unboxed tag.
it was working for less than an hour, transmitting the data, but then stopped.
opening up the enclosure, the red LED was flashing in the repeating pattern:
blink, pause 1 sec, blink, pause 1 sec, blink, pause 1 sec, blink blink
I could try re-flashing the firmware. as for now, i’ve just powered it off to avoid burning any battery.