The script doesn't check if it has permission to write.

[mio-19]

I used this script to root Huawei MobileAppEngine, which is basically an modified AVD.

In powershell

$env:ANDROID_HOME = "C:\Program Files\MobileAppEngine\EmulatorSdk"
.\rootAVD.bat "system-images\android-28\default\x86_64\ramdisk.img"

When I ran it in normal powershell, the script completed successfully but no file was changed.
Then I ran it with admin priv, everything works perfectly.

[newbit1]

dont use PS, take cmd.
but this wont solve your admin rights issue.