I had a failure with 07.01.1. The WebUI got stuck at "loading" with spinning wheel. I had to downgrade to 14.3 via bootloader, then 1.4 and finally 07.01.2.
The problem seems to be APN/RAM related. With versions 14.3 & 14.4 loaded, the mobile data won't connect, status remains "disconnected". With 07.01.2, it connects and an IP is assigned, but the IP isn't reported to the nominated MAC address.
Overnight, the device became unresponsive and I had to start again via bootloader. Attempted to upload 07.01.2 and received a checksum error, uploaded 14.4, applied settings and updated to 07.01.2.