That, in turn means that you’re unlikely to be able to find a way to get iOS 14.3 installed without jumping through a whole lot of hoops.
You might have some success if you happen to have your iOS 14.3 BLOBs saved and then there’s the option of using something like futurerestore.
We’ve covered the process for running through that before so be sure to check that out if you need to go that route.
Regardless, anyone who is running iOS 14.3 right now and might want to jailbreak at some point in the future would be best served by staying as far away from iOS 14.4 as possible. The same goes for any further updates that Apple might release between now and a new jailbreak being made available for iOS 14.4.
This cat and mouse chase between Apple and jailbreakers is nothing new of course, but it shows no sign of coming to an end, either. It’s just something you have to contend with if you’re going to go the jailbreak route.