Well, that didn't take long. TeamWin has just dropped a new version of its TWRP custom recovery designed specifically for the Flo – the new Nexus 7. As usual, it's a fairly simple procedure with a Nexus device to get a custom recovery running, which allows you to flash root. The Android 4.3 SuperSU file is already out there, so we're ready to go.
First, grab the TWRP image from the TeamWin site. Then get the SuperSU zip file right over here. Put the SuperSU file on the Nexus 7's internal storage, and move the TWRP image to the folder where you have ADB and fastboot. Before you get started, make sure your bootloader is unlocked (fastboot oem unlock). Then do the following:
- Flash TWRP from the bootloader (fastboot flash recovery FILENAME.img). You can try using boot instead of flash, but it didn't work for me. Reasons unclear.
- Reboot into recovery (adb reboot recovery or hold Power+VolDn, then select Recovery).
- Flash SuperSU from Install > Download.
- You should be rooted.
I've tested the process, and it appears to be working. SuperSU is on the device, and root applications are running as expected.