Hi
I had a very similar situation recently. I went from openATV 6.2 to 6.4 (beta) on wooshbuild infinity (but 6.3 should be fine). I could not find cccam in the softcam section or the plugin downloads, although if you go into the decryption & parental control section softcam section cccam is already there, along with an oscam option. I had saved my settings using the option given in openatv before I flashed the box, so I restored settings from there. But starting the cccam didn't work. I checked the folder it was saved in before and the line was there but the cccam wasn't working. I tried re-installing openatv and wooshbuild but still it wouldn't work. I downloaded the OpenATV Softcam Feed 4.3_r4 from this site but no luck.
In the end I searched youtube and found a video showing how to change an n: line to oscam using a free program called "CCcam to Oscam Converter". This will convert c, n & f lines into an oscam.server file. I then went onto the plugin section and downloaded oscam_stable 1.2 i think (can't exactly remember which version). Then using filezilla ftp client I connected to the box and found the oscam section. In one of the folders you'll find a file called oscam.server. I opened this and it was populated with all different line types. I then opened the file created by the CCcam to Oscam Converter. I then scrolled down the list on the file on the box until I found a section which looked like this:
[reader]
label= taken from created oscam.server file
enable=1 (might be 0 on file on box, need to change to 1)
protocol=newcamd <-- already in the file on the box
key=taken from created oscam.server file
device=taken from created oscam.server file
user= taken from createdoscam.server file
password= taken from created oscam.server file
group=1
inactivitytimeout=1
reconnecttimeout=30
lb_weight=100
cccversion=2.1.2
cccmaxhops=10
cccwantemu=1
ccckeepalive=1
Basically I copied over the details made by the CCcam to Oscam Converter to the file on the box, i even kept the formatting i.e everything was inline with the figures above, don't think its important but thats the way I did it. I included the last few that were created by the converter on to the file on the box. Saved the information and uploaded back to the box using filezilla. Now I had to restart the box.
After that I went back into the decryption and parental control and started the oscam_stable softcam and everything started up. All the channels working and very stable, much much more than when I was using cccam. The channel changes can be a bit slow and a frozen picture very rarely, but that's a small price to pay for how stable and glitch free it really is. Up till now I was thinking there was an issue with either the line I had or the internet, as I have the box connected through a homeplug but it was all down to the cccam.
Anyway I hope this helps, I know how frustrating it can be.
All the best
ashp20