if i reset fire stick 3 can i still jailbreak to turn on developer options? no option in settings.
Yes, you are just reseting it, yhat option will still be there.
Only if you bypass the update when it boots up. Otherwise you did a factory reset for nothing. I posted instructions on here somewhere on how to bypass the update. You basically use a hotspot and kill it when the update starts happening then push some buttons to get to a voice assist page then back out of it and proceed with your account login.
This works until they figure out how to permanently change the internal memory for the factory reset settings after every OS update. Totally possible that becomes a thing. That’s why I blocked updates a long time ago and will never update unless something stops working.
This video shows how to turn on developer options after the last update.