I bought a WP10 a few days ago and successfully updated it to the latest version with no problems or bricking. It has been stable for 3 days now.
It is showing OS build 10.0.14393.1066.
I used the latest TH2 version of the interop tools here: https://forum.xda-developers.com/showpost.php?p=73608163&postcount=1006
I found these to be useful resources in case anything went wrong:
https://answers.microsoft.com/en-us/mobiledevices/forum/mdlumia-mdupdate/windows-10-mobile-wont-install-some-update-it/fb70d34f-c01c-4e89-8cf1-3b148d245d7c?auth=1
https://forum.xda-developers.com/windows-10-mobile/looking-to-upgrade-cube-wp10-phablet-to-t3523595
https://forum.xda-developers.com/windows-10-mobile/cube-wp10-restart-loop-deploying-t3546982
https://forum.xda-developers.com/windows-10-mobile/stock-fw-cube-wp10-t698-stock-firmware-t3656755
The last one contains links to forum posts (in Chinese, so view in Chrome so automatically translated) desrcibing how to revert back to WP10’s installed firmware. Useful as a last resort.
Am loving the WP10 – it is a great bit of kit. Just need to sort Netflix and the screen offset now!
Hope the above helps someone.
Robin