After the OTA update and a complete reinstallation with /e/OS build V.1.10 failed (see above), /e/OS build V.1.7 and e-Recovery V1.7 were successfully installed again.
During today’s OTA update of /e/OS build V.1.11 the same errors occurred as with /e/OS build V.1.10. Also a reinstallation via adb sideload e-1.11-r-20230512289175-dev-h850.zip left a non-functional LG G5 H850. Only the e-Recovery build V.1.11 was able to work.
For another installation attempt, I extracted the custom ROM /e/OS-R e-1.11-r-20230512289175-dev-h850.zip and ddecompressed the system.new.dat.br file to get the system.img file as the final result. This system.img file and the boot.img file were then installed on the LG G5 H850 via fastboot flash. The result was as disappointing as the previous installation attempts: My H850 only booted into the /e/Rocovery, but not into the system.
For comparison:
Fresh clear installation with lineage-19.1-20230514-nightly-h850-signed.
Result:
Flawless startup and perfectly functioning without FM radio.
Basic requirements LineageOS Wiki
The LineageOS installation guide explicitly states that LOS 19.1 should only be used with the LG G5 H850 stock Android 7.0 firmware:
WARNING: Before following these instructions please ensure that the device is currently using Android 7.0 firmware.
If the vendor provided multiple updates for that version, e.g. security updates, make sure you are on the latest!
If your current installation is newer or older than Android 7.0, please upgrade or downgrade to the required version before proceeding …
Although LOS 19.1 also works with the LG G5 H850 stock Android 8.0.0 firmware for me, I did the recommended firmware downgrade to Android 7.0 firmware and completely reinstalled /e/OS V.1.11.
And lo and behold: /e/OS V.1.11 boots up to the animated e-logo. But then nothing goes on. After 15 minutes I aborted the sorry scenario disappointed.
The subsequent complete reinstallation of LOS 19.1 build lineage-19.1-20230514-nightly-h850-signed with lineage recovery works right away.
By the way: The reboot process of LOS 19.1 from the lineage recovery takes at most one minute and not 5-10 minutes as described in the /e/ documention.