Fairphone FP2: Upgrade auf LineageOS 16.0

Ist das eigene FP2 bereits mit LineageOS 14.1 verschlüsselt, so ist ein Upgrade auf LOS 16.0 nicht ganz simpel. An den Verschüsselungsfunktionen von Android wurde fleissig gearbeitet und geändert.
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Boot- und Screenlock verschieden einrichten (LineageOS 16.0)

So konfigurierst Du Dein Boot- (encryption key) und Screenlock-Passwort unter Android unterschiedlich.
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LineageOS: Install TWRP on Galaxy Tab S2 SM-T813

Installation is mainly according to the instructions of LineageOS. However, it must be varied on the following point: You have to use heimdall version >= 1.4.2, because of a print-pit bug. How to start twrp recovery directly from download mode: After flashing with heimdall, Press and hold POWER + HOME + VOL DOWN when the screen is blank, then press and hold POWER + HOME. Otherwise, the tablet cannot start recovery directly.
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Android: Full-Disk Encryption

I had some problems to encrypt my FP2. Cause was that this FP2 was already encrypted before. It seems a LUKS header problem. So this was my solution: Boot into TWRP recovery and drop a root shell: ls -1 /dev/block/platform/*/by-name/userdata /dev/block/platform/xyz/by-name/userdata dd if=/dev/zero of=/dev/block/platform/xyz/by-name/userdata bs=1M This overwrite very block of the userdata partition with zeros and consumes a lot of time (my last try was 10 minutes)! Be careful with this.
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