How to get the key used for the encryption of sdcard (internal storage)

[AnotherElk]

@newlukai

There is an instruction on Android Enthusiasts on how to decrypt an adoptable storage. To achieve this one needs to get the encryption key from /data/misc/vold. And this is possible on a rooted phone.

Interesting, but I wouldn’t get my hopes up too high, the instructions are over 4 years old.
Over at the /e/ forum it was mentioned that possibly there was progress in that regard …

But according to what I know it is stored in a secure environment and even if you are rooted you can’t just access any “decryption_key.txt” file. Same thing for iPhones for instance.

---

@newlukai

On the Fairphone support site I didn’t find a hint on how to root a phone, but there is a description on how to unlock the bootloader, but it claims it will wipe all the data on the phone.

That’s correct. Unlocking as well as locking the bootloader will force a factory reset for security reasons.
Unlocking the bootloader is not the same as rooting the phone, but as I understand it you need to have an unlocked bootloader in order to be able to root the phone.

Has anybody contacted Fairphone about this?
They reintroduced the easy way to incorporate an SD card into Internal Storage after they initially (and wisely) delivered the Fairphone 3 with Android 9 without that possibility.
Now they have a bug in their Android 10 which apparently causes data loss with this setup.

Android 10 - MicroSD as phone storage

To anyone affected by the internal storage formatting issue (in this topic @Federico_Iadarola @Tschulius @brianleach @magoo @AnnaTreurniet): Fairphone can’t reproduce this bug. Therefore, if you want them to work on it, please #contactsupport specifying in the subject: “A10 - SD card phone storage issue”, precising which SD-card model you own. The more data they will have, the better they will be able to work on it Can you also all confirm you are on the latest build of FPOS? If …