AccessPro UHF 6B Card

Hi. I tried to read and store the info of an AccessPro UHF 6B card, with no luck.

It seems that it works in a frequency between 860/960 MHz.

Can Flipper Zero read this cards?

You could try this app - GitHub - frux-c/uhf_rfid: this is a uhf app for the flipper zero, that uses the YRM100 module.
with additional antenna YRM100.

Could you give a step by step instructions please. I just bought this yrmu module with your recommendation. If you could please show us how to connect, and how to add that app to flipper zero please

Install the app for your firmware. (build from source/install via mobile app)
Connect module according to the diagram at GitHub - frux-c/uhf_rfid: this is a uhf app for the flipper zero, that uses the YRM100 module.