✅ Main changes:
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Android Security Patch level: 3/5/2020;
Android System Webview: 80.0.3987.132;
Add root access controller in Settings (just like the one in 16.0, more convenient);
Disable SystemUI anti-falsing on lockscreen;
Downgrade audio HAL to 2.0 (as the device never used newer versions after all);
Drop init/d support (as it's not supported officially);
Implement custom post-boot scripts (as a replacement of init.d, which is more stable);
Kernel improvements:
└ Backport binder driver from linux-4.19;
└ Convert to new shrinker API;
└ Disable CONFIG_BUG completely;
Only setup ZRAM on deivces with 2GB RAM;
Re-enable SECCOMP and correct policy;
Remove some unavailable settings (they shouldn't be there);
Some other optimization and improvements.
Additional Information:
⛔ Known issues:
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SELinux permissive;
VOLTE (no IMS stuff from Qualcomm, won't fix).