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Unofficial build of LineageOS 18.1 (Avicii)
Security String: February 2023
This build is an unofficial continuation of majorp93's LineagOS 18.1 builds that have been available via this thread: [ROM][12.1][UNOFFICIAL] LineageOS 19.1 - microG [OnePlus Nord/avicii]
Other than that a plain build of LineagOS 18.1 upstream sources with some small tweaks (see Sources 2).

Comming from official 17.1 builds you have to flash:
1. lineage-migration-official-to-unofficial.zip
2. This ROM
... else bad things will happen!
Notice: Data Partition either has to be decrypted or your recovery must support data decryption for this procedure to work.
Suggested Recovery: TWRP 3.7.0

Sources 1: LineageOS Sources 2: GitteHuber's Github Questions: ReginaRainbow on XDA SHA256 Files: here
Use just if you know what you're doing!