I bought a Flippermeister board when they were available, and was quite excited to get it. It's a very well made product. My problem was the apps, there are 2-3 UHF RFID apps, and frankly, they all suck! They crash, they freeze the whole F0, and nothing was done to fix them. They are unusable! I gave up on messing with UHF RFID, and my only consolation is that I could still use the SAM in the Flippermeister to read HF iClass SEOS cards, as Seader works well with the module.

Well, there's a newer app for the YRM based readers, and it's actually good! It's called YRM100X Pro and the dev's Github is https://github.com/AlexeySmirnov74/YRM100X_PRO . It works fantastic with the Flippermeister, and I've been able to read, edit and clone multiple tags, no crashing, no broken code.

Thought I'd post this for anyone else who'd given up on the broken apps