All KT3s with any factory (never-updated) firmware are downgradable to the initial factory firmware 5.8.0.
Most of the PW3s with the factory (never-updated) firmware 5.8.11 (currently shipping) are downgradable to the initial factory firmware 5.8.9.0.1 (under some conditions and risk).
We still have few reports about KOA2s with the factory (never-updated) firmware shipped directly from Amazon (to avoid any wi-fi connections by resellers).
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