I had the same problem with Ting. Turns out if the APN type does not include "default", you cannot select it in CM12. The default APN setting for Ting was simply "mms", so I copied the setting from a Sprint APN and used it and it was successful....
Yeah same issue. Then how can you flash further?
There is another thread about this problem here. A workaround is provided by ihartley:
Access /data via a file manager (as root) and copy the zip to /data . You can then access it via ...
Im S-ON, can I intall?
I'm S-ON and it installed fine. I rooted with the official HTC unlock procedure and flashed the latest m7 TWRP then flashed the rom and gapps. I skipped the boot image and I was fine, I don't think it can hurt to try skip...
MMS proxy: 22.214.171.124
MMS port: 80
APN type: mms
APN Protocol: IPv4/IPv6
APN roaming Protocol: IPv4/IPv6
Lastly make sure bearer is unspecified. Press menu an...