I cant install Google Camera

[akxsh]

I noticed that in the recent , Google Camera on my Asus Zenfone Max Pro M1 has better camera than the stock camera app on the phone .
According to the XDA FORUMS THREAD
https://www.google.co.in/amp/s/www.xda-developers.com/asus-zenfone-max-pro-m1-google-camera/amp/
I have tried to install it by the instructions given and atlast ,,,
When the bootloader is open and I try to enter oem enable_hal3 true it shows waiting for device ..
Please help me