On-Ctrl released its new smart phone APP V1.8 last week. The new APP can fix the problem where Ring was bricked by old APP during Ring firmware update.
Please see below instructions on how to use APP V1.8 to revive the Ring.
Android & Harmony instruction on how to revive the Ring: How_to_revive_the_ring_after_an_upgrade_freeze(Android).pdf
iOS instruction on how to revive the Ring: How_to_revive_the_ring_after_an_upgrade_freeze(iOS).pdf