The short story: I tried to update from CM11 to CM12 snapshot on 9/1/2015, but every CM based ROM would get stuck at CM boot logo, and this is true with the latest TWRP and latest Philz, along with the snapshot CM recovery provided at the official download page. After downgrading to TWRP 2.6.3.0 at the suggestion of http://forum.xda-developers.com/note...2972922/page32, I got it working.
The long story:
I tried to update to CM12 over the air from CM11. That didn't work, as my philz touch recovery just boot directly back to CM11. It's too quick for me to see the install logs, but there was some error message like "can't install" etc.
So I thought maybe I need a different recovery, since the update notice does say "compatible recovery required" and I saw there is such a recovery in the CM download site.
I flashed cm12.1 snapshot recovery using flashify but I got stuck in a boot loop.
I then flashed the recovery using heimdall and that worked.
I then flashed cm12.1 snapshot using the cm recovery, but that was stuck on the cm logo for at least 4 hours before I shut it down.
I then tried a couple more times and it's the same thing.
I installed other cm11 versions and they all get stuck on the logo (even though I came from cm11).
So I tried a different recovery, the latest version of twrp and long story short it's the same thing with cm roms.
Then I flashed back to philz touch (but I didn't realize that I flashed the latest version) and it's the same thing.
Even after I restored a previous backup, the cm11 rom wouldn't boot up.
At the end I was able to use odin to flash back to stock.
I can also flash rwilco's NE2 based ROM.
I have also tried cyanideL, which is CM12 based and it gets stuck too.
Finally I found the post mentioned above and downgrading to TWRP 2.6.3.0 worked.
Hopefully this post will help someone down the road.
The long story:
I tried to update to CM12 over the air from CM11. That didn't work, as my philz touch recovery just boot directly back to CM11. It's too quick for me to see the install logs, but there was some error message like "can't install" etc.
So I thought maybe I need a different recovery, since the update notice does say "compatible recovery required" and I saw there is such a recovery in the CM download site.
I flashed cm12.1 snapshot recovery using flashify but I got stuck in a boot loop.
I then flashed the recovery using heimdall and that worked.
I then flashed cm12.1 snapshot using the cm recovery, but that was stuck on the cm logo for at least 4 hours before I shut it down.
I then tried a couple more times and it's the same thing.
I installed other cm11 versions and they all get stuck on the logo (even though I came from cm11).
So I tried a different recovery, the latest version of twrp and long story short it's the same thing with cm roms.
Then I flashed back to philz touch (but I didn't realize that I flashed the latest version) and it's the same thing.
Even after I restored a previous backup, the cm11 rom wouldn't boot up.
At the end I was able to use odin to flash back to stock.
I can also flash rwilco's NE2 based ROM.
I have also tried cyanideL, which is CM12 based and it gets stuck too.
Finally I found the post mentioned above and downgrading to TWRP 2.6.3.0 worked.
Hopefully this post will help someone down the road.
