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Synced with latest LineageOS 15.1 source code.
Some RIL patches by @masemoel
Security patch: 2021 April 5.
Additional Information:
As of now, in LOS 15.1 Bluetooth and RIL are not working. (Deep voice and / or no SIM card bug is present!) also, auto rotation causes reboots in Camera, Gallery and Dialer apps.
I recommend using the 14.1 builds for now.