After I update my nexus 7 to jelly bean 4.1.1 and try to boot into stock recovery mode, I got the little green dude with the red marker on top and fail to get into recovery mode. It says that it is read-only, and doesn't allow me to rename or change. it. Using both CWM and TWRP Recovery get the same issues.
Sirius Applications Limited developer has released Quick Boot (Reboot) Android app in the Goolge Play store. It help you load into Recovery and Bootloader with one tap. First load into Fastboot Mode, connect Nexus 7 and Mac/PC computer via USB cable and then get into recovery mode quickly and easily. Hope Google fix the bug as soon as possible.