So this will secure my device from jailbreak
It will secure from the security issue that can be exploited in potentially various ways (jailbreak just being one of them).
no beta? that was low even for apple.
Typically something like a security patch, especially one of higher importance that needs to get out sooner than later, won't get a dev/public beta.
Need a changelog from Apple. Not all of us use these devices for personal use.
The security changes are available from Apple, but they get listed within about a day or so after the update is released to give more people a chance to install the update and have the security issues patched before the details of those security issues are made public (and could potentially be exploited by someone on those who didn't get a chance to update). In this case it seems to have happened even faster:
https://support.apple.com/en-us/HT207026
Didn't think we'd see the day where we would have a 9.X.4 update
Well, we even had an X.4 release (with iOS 8.4).
Of course, as long Apple's servers are still signing 9.3.3, which should be the case for a week or so just to make sure 9.3.4 isn't borked. After that, nope.
I miss the days when you could restore from locally saved SHSH blobs.
It's possible that with a security issue in play Apple might stop signing the previous version earlier than they typically do.
Seriously why do people want to jailbreak their phone these days?! Go buy a Samsung then.
Then they probably complain when their phone gets hacked.
Why do you jail break?!
That's so mean of Apple. A patch to stop jail breaking.
To address a security issue (that the jailbreak happens to use as well).
This update BRICKED my iPod 6G. I've had various iDevices for over 10 years, first time I've had this happen. Will try again later in case the problem is on their end. In the meantime, not updating my others. The OTA update was 1.2 GB, so I decided to use iTunes. In hindsight probably not the right decision...
So...not actually bricked?
Until Apple allows Tethering app on App Store, I will need to be jailbreaking.
Tethering is generally in the realm of carriers and their plans/features, so it's not really something for Apple to allow.
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What real security issue? What severe security hole? Afaik, no jailbreak exploit has been used as an attack vector against iOS. Are jailbroken phones less secure than regular phones? I'd say yes, but that's a consequence of loading software from outside sources. Not a consequence of the jailbreak exploits. Is patching security holes the best solution for iOS users? Undoubtedly yes. But what you're doing is tantamount to fear mongering and concern trolling; equivalent to "but think the children".
It's not necessarily about it actually getting exploited as much as it being in existence and in the wild so to say. If it's there and it's known and someone could abuse it (even if no one really does) it's on Apple to address it. We all know that should one day someone actually exploit something before Apple patches it, everyone will be all over Apple for it, no matter how rare (even if just plain never) it happened in the past.