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Have you verified the emitter is still good?
i assume you already tried bypassing the switch so that leaves the driver 
contact olight and see what they say
i have the same light, i have not gotten the top off of it but i only tried briefly
I have only used mine a handful of times, its a good light but doesn’t meet my needs for higher brightness and more throw but it has a very low low which is very nice, and is very pocketable
Pull out the driver assembly and pop it back in. Make sure you twist so it snaps into its proper position.
I know it seems unlikely to do anything but i have had some good luck e-mailing companies with out of warranty items, several have shipped me replacements free of charge (and many more under warranty, why is everything so cheaply made today)
Also can you test the components on the driver or have you don that already?
i did not know about the warranty, don’t mention the LED swapping, you already know its not an LED related failure