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I have limited iCloud back-up. I have no iTunes back-up.
Before IOS 12 recovering data after reset is very easy. After IOS 13 it becomes more difficult.
So, for professional engineers, is it now still technical possible to recover lost data in the hard drive of IPhone 11 64GB?
I only need the apple "Note". I thought I have all my valuable notes back-up online, so I erase the phone. But later I found out that my Cloud is full.
No, this is not possible for any practical scenario.
It is also totally false that this was "very easy" before iOS 12.
This is basically a duplicate of your other question here:
How to copy all bytes of a phone (formatted or not, 64GB/64B) into a computer hard drive?
where I detailed in lengths why it is not practically possible.
It being practically impossible has nothing todo with snapshots, disassembly of the device or how solid state storage differs from tape or hard drive storage.
It is all entirely down to the fact that the data was encrypted with the AES-256 encryption algorithm using a key derived from information that was previously stored exclusively within the Secure Enclave in that phone - and now gone. There's no practical way of getting that key from the Secure Enclave now, and there's no practical way of breaking the encryption with the key gone.
The data is lost for you.
Just to answer your previous counter-arguments from the older question:
No, that newer and faster computers are released every year will not change the fact that the data is lost.
No, that you have 1000 years of time on your hands for brute forcing will not change the fact that the data is lost.
No, that you have access to "Apple coders" with "secret information" about the encryption will not change the fact that the data is lost.
No, even IT-professionals will not be able to get your data back from that data storage on the phone.
Your only realistic way to get your data back is to hope you have a backup somewhere. Look for old backups, old revisions of data stored in iCloud, perhaps you've sent the note via text to somebody else earlier - things like that. From your descriptions, I would take a closer look at older iCloud backups of your phone, as well as look at iCloud.com to see if your Note should be synchronized there afterall.
There's also the theoretical possibility that we covered on the other question - namely that you suddenly make a world-class break through in the state of code breaking and find a major weakness in the AES-algorithm that allows you to decrypt the encrypted data quickly without having the key. In that case, you would probably be able to make so much money and fame off of having that new insight that you wouldn't be thinking about recovering data from your decades old iPhone at that point.
In addition, there's a theoretical possibility that it is later discovered that Apple is using weakened encryption - for example due to being strong-armed in to doing so by the US government. If that is revealed in years to come, then it might so happen that someone figures out how to break that weakened encryption in a practical timeframe. I would discount this as being a very theoretical possibility. It is not practical. I would rather spent that time and energy on buying a lottery ticket basically.
Yes, until the storage is over written the encrypted data exists still. This recovery you contemplate is by no means trivial due to several factors.
As a practical matter, the data is well gone unless you bring sufficient technical skills to bear on your problem of not having a backup. Skills and tools that worked for magnetic rotational hard drives don’t translate directly to iPhone hardware design.
