Just to mention it:

Updated a Sony Z3c running #CarbonROM and upgraded a tablet running #LineageOS. Thanks for all the people who build these systems!

It took me about two hours to

• get the backup on the Sony working in twrp with a sdcard
• do full system backups
• update CarbonROM manually, because the reboot into recovery doesn't work
• getting a stable usb connection to the tablet by rotating ports, cables and orientations of the plugs
• install a newer version of recovery.img on the tablet
  • needed to recap how this is done in Linux using heimdall
• install the newer LineageOS via adb sideload

Looking back at the process I prefer much upgrading my #Librem5 and I need to get back to the idea of getting a #Librem11 to get rid of the dependency on the LineageOS tablet.

This way the update works also. When a new version of #CarbonROM is found

• confirm to download it
• select to install

→ Phone reboots

• press and hold volume-down and power button

→ until twrp starts loading. It then will automatically install the downloaded update.

Note to myself:

When I want to start my Sony #z3c installed with #CarbonROM in #recovery mode I need to to switch it off, disconnect usb and then push and hold volume-down and power together until I see #twrp starting.

remember:

• disconnect usb
• shutdown / switch-off the phone
• press and hold volume-down and power button …
• …until you see twrp booting

Don't try adb, don't try rebooting from CarbonROM into twrp - you didn't get it to work the last time you tried