Digital Ocean: Kernel Panic After CPU & RAM Resize

Hi there, Digital Ocean Community, I have a digital ocean droplet that was on $56 per month with premium intel CPU & 8 Gigs of Ram. We had purchased this server two years ago. Now due to some reasons, we had to upgrade the ram of server.

After initial research, we upgraded the RAM & CPU (Only) option and didn’t go with anything besides this.

For this, I booted in my droplet and wrote the command:

shutdown -h now

After turning off droplet safely, I upgraded the ram & cpu of server which took only 1 minute.

After that I rebooted into server and from that time I am getting

“end Kernel panic — not syncing : VFS :Unable to mount root fs on unknown—block(0,0)”

I tried talking with support team, and they sent me some commands + Urls to websites to follow to resolve the issue.

But nothing has been helping me so far. What’s more troublesome is that I cannot create another droplet, because there’s a lot of data on existing droplet.

Here’s what I have followed so far:

mount /dev/vda1 /mnt
mount --bind /dev /mnt/dev
mount --bind /dev/pts /mnt/dev/pts
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt/
grub-install /dev/vda1
grub-install --recheck /dev/vda1
update-grub

Can anyone please help me out on this issue?