MX4300 Partition 2 Corrupted

Hello guys.
I had a linksys MX4300 and flashed it with openwrt on both partitions.

Then I tried to use sysupgrade to return back to stock which corrupted one partition, and the other partition runs openwrt.

Now the problem is I can't upgrade my firmware as nothing can be flashed on partition 2, also my snapshot has some problem with ssh so I cant scp/wget firmware into the temp folder.
Kindly help.