Are still able to see the edison drive ?
If so, as SOP I always delete everything off of it. Then I copy the new image files on to it and then flash it.
I would try that and see if it helps.
I can see Edison Drive, it looks all other things are ok, and I can also copy image to Edison and flash it again.
Edison is done using hidden partitions on the MMC.
I know this, because I erased them and thought I had bricked my edison. But I found a way to recover it.
Let me know if the reflash helps.
it cannot recover SSH, I tried twice to reflash Edison.
The only other things I can suggest are to try the method I used: Re: EDISON BRICKED ! MMC 2nd Partition with FWI erased, can this be fixed ?
Or you can try using Phone Flash LITE: Re: Edison Won't Boot After Trying Flash Tool Lite
each image flashing changes Edison host identification key for SSH communications.
The first time you connect via SSH to the IP address by your Putty (or other client), it stores the key into the so-called known hosts.
Next time you connect to same IP address it verifies this key.
If the key does not match, it is assumed that someone on the route doing something nasty and don't connect for security reasons.
You must first delete the old value of this key for the IP address or name.
Putty store keys in the registry HKEY_CURRENT_USER \ Software \ SimonTatham \ PuTTY \ SshHostKeys.