Thanks m0tral. Maybe that is my issue.
I had no idea about keys and differences between cards. Mifare is a new idea/concept to me :)
Mine for sure will have secure data cause it belongs to my office Company.
What kind of error you face?
I had none. Indeed I downloaded the lastest version (published one week later my post) with no errors.
I passed it to my smartphone and from the Files manager app, I installed it in the phone.
Hey+ official app is not anymore in the EU Play Store. Right.
But you can download it directly from the official site to your PC. Then copy/paste it to your phone
黑加-小米应用商店 and install it ;)
You will have to switch language from chinese to english.
That is not true I'm afraid.
NFC card opening and transport cards features only works in China.
Outside China borders is impossible to use it. It is not a matter of hacking or modding any firmware or app.
It is just a matter of legal stuff.
I emailed chinese support (inside the Heyapp+ itself)...