Is there a way to protect android devices so that the
- user is no more able to download/install other apps?
The idea is to lend devices with specific apps.
Ideally the owner (that’s me) should be able to remove the protection using a password/passphrase
Nope, don’t think it can be done on a stock device.
If there is a way it is probably within the Device Administration API
Likely though is that if you want to achieve this you’d need at least a rooted device, and maybe even your own custom build of the OS to allow for it.