CyanogenMod is a free, community built, aftermarket firmware distribution of Android 7.1 (Nougat), which is designed to increase performance ...
Downloads (for posterity)
Gapps - use any ARM (not ARM64) 6.0 variant. Do not boot the ROM before flashing these, or you will have to factory reset. For Now on Tap, use mini or higher
Build 7 - 2015-12-12
Build 6 - 2015-12-1...
LineageOS is a free, community built, aftermarket firmware distribution of Android 7.1 (Nougat), which is designed to increase performance and reliability over stock Android for your device.
Robotic voice during calls?
Make sure you're on the I9300XXUGMK6 modem. Instructions are here
CM ships with root, enable developer options and look in Settings -> Developer options -> root access
Google camera crashes?
Use Google Came...
(click the image)
Builds should start tomorrow (2015-12-16 UTC). Download them from here. You should be able to dirty flash over these builds, but if you do run into any issues, factory reset....