Flashing U-boot on a Google Nexus 7 2012 (grouper)

[Benjamin Freeman]

Hi,

I'm trying to flash U-boot on a Nexus 7. I've followed the instruction 
from this page of the Read the Docs 
<https://docs.u-boot.org/en/v2025.04/board/asus/grouper.html#u-boot-for-the-asus-google-nexus-7-2012> 
but I'm stuck at the "Flashing with the NV3P protocol" part. I can't 
figure out where should I get the android_bootloader.bin file mentioned 
in the command: $ 
./run_bootloader.sh-sT30-t./bct/grouper.bct-bandroid_bootloader.bin

Does anyone have an idea?

Thank you in advance,

Benjamin Freeman