Hi Colin
Did you ever get a jfirmware package for the SRX210? (12.1x46?). I'm struggling myself to find this. There is another thread that Juniper have been responding to requests and uploading them temporarily to ftp shares but I'm not sure it's still active. On a device that's already EOL I'd be frustrated if I had to renew support on a device especially as it won't receive even software updates after 6months or so from now.
Thanks