Wiki source code of Erase LG V20 Disk Encryption Key
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| author | version | line-number | content |
|---|---|---|---|
| 1 | In a LG V20, Full-Disk Encryption (FDE) makes use of Secure Execution Environment (SEE, by Qualcomm). The password/pin you provide to Android will be used to unlock encryption key stored in SEE. | ||
| 2 | |||
| 3 | When Lineage OS (as of 17.1) encrypts an unencrypted disk, it tries to set up SEE with your password/pin. If SEE was already previously set up with an old password/pin at that time, it will reject the attempt by Lineage OS to set up a new one. This drops your phone into a boot-loop because Lineage OS is not able to make use of SEE for FDE. | ||
| 4 | |||
| 5 | If you erase the current key from SEE then SEE will accept a new setup from Lineage OS. | ||
| 6 | |||
| 7 | How to erase FDE encryption key from SEE: | ||
| 8 | |||
| 9 | 1. Root - use magisk | ||
| 10 | 1. Download the attached [[(% class="wikiattachmentlink" %)##mymod##>>attach:mymod]](%%) binary executable into your phone. | ||
| 11 | 1. Do adb shell | ||
| 12 | 1. Become root: ##su## | ||
| 13 | 1. move the ##mymod## file into ##/sbin## | ||
| 14 | 1. ##chmod +x /sbin/mymod## | ||
| 15 | 1. Run: ##/sbin/mymod## | ||
| 16 | |||
| 17 | You can check whether it's successful by looking at logcat for lines starting with "mymod". Indication of a 0 status means successful. | ||
| 18 | |||
| 19 | After running mymod and successfully removing the pre-existing encryption key from SEE, you can immediately ask Lineage OS to do FDE. |