HELP! Adding NDEF onto the Estimote Beacon


I just bought a few of beacons, and tried to write NDEF Tag onto the Estimote Proximity Beacon. Now, I want to write piece of text (Block 1, Block 2, etc. for specific beacon).

I tried to download the NFCStamps sample, but in order to use the app, I had to change the AAR of that beacon which I believe is not the efficient way to do it. I also looked at this link: How to write NFC tag but the link that has instruction of “how to use the SDK to connect to and access the configuration API” is broken. I’m wondering whether is there any way that I can write the NDEF tag onto the beacon or if any of you has a link?

Thank you