Android 8.1 Oreo on Nexus 7 2012 WiFi

Thanks to ud4, LineageOS team, TeamWin and everyone else that made this build possible.

1. Backup / transfer personal data (texts, photos, videos, apps, etc)
   
   
2. Read [ROM][grouper] [8.1.0] [UNOFFICIAL] LineageOS 15.1 [2020/05/22]
   
   • download lineage-15.1-20200522-UNOFFICIAL-grouper.zip (270 MB)
   • download MindTheGapps-8.1.0-arm-20180808-grouper.zip (53 MB)
     
     
3. Download Android SDK / platform-tools
   
   
4. Install TWRP (Team Win Recovery Project) for Nexus 7 2012 Wifi
   (twrp-3.3.1-0-grouper.img, 9.6 MB)
   
   Follow Fastboot Install Method (No Root Required) section.
   
   
5.  Boot into recovery mode (TWRP) with:
   

   adb reboot-bootloader

   Use Volume Up or Down keys to select "Recovery Mode", then press "Power".
   
   
6. (Recommended) In TWRP, choose Wipe > Advanced Wide > Change File System for cache and  Data from EXT4 to F2FS
   
   


7. Back to TWRP main screen > Advanced > ADB Sideload > Swipe to Start Sideload
   
   
   
8. Sideload new ROM from your PC:
   

   adb sideload lineage-15.1-20200522-UNOFFICIAL-grouper.zip

   
   
9. Sideload GApps ROM from your PC:
   

   adb sideload MindTheGapps-8.1.0-arm-20180808-grouper.zip

   
   
   
10. Reboot system