Boot process stuck at "grub>" prompt.

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Issue

We were trying to update the partition ID using parted, and by mistake the partition ID of /boot partition was set to 8e (i.e. Linux LVM) and now GRUB boot loader is no longer able to load, it shows following error:
```
grub>
grub> root (hd0, 0)
grub> kernel /<tab key> and shows partition 0 "filesystem type unknown"
```

Environment

Red Hat Enterprise Linux 3, 4, 5, 6

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