ASUS Nexus 7

I couple of years ago I bought Nexus 7 (2012) for my wife. She liked enough to stop using our e-ink Kindle, but last last Black Friday we decided to updated her reading tablet to Kindle Fire and turn Nexus 7 into a kids' tablet.  Somehow I managed to updated the device Android 5.1.1 (grouper), but it didn't work out well. It was lagging and too slow even for basic tasks, so we just threw it to the bin of abandoned electronics and
With Luther using Google Apps (G Suite?), I decided to give the old friend another chance. It's working great now, handling email, Docs, and Twitter just fine. Here are the links to tutorials, in case I forget.
[ROM][4.4.4][F2FS] Unofficial SlimKat 9.1 (grouper/tilapia) | Nexus 7 # ROM itself, fast and stable
Nexus Root Toolkit v2.1.9 # great tool, eventually I managed to use it for the update
Asus Nexus 7 2012 Wi-Fi # TWRP for ASUS Nexus 7 (2012)
How to Install TWRP 3.0.0 Recovery on Asus Nexus 7 # TWRP installation tutorial (optional)
How to Install CyanogenMod on the Google Nexus 7 (Wi-Fi, 2012 version) ("grouper") - CyanogenMod # adb and fastboot guide (optional)