On a Corellium Virual Device, Certain patches are applied to the kernel to maximize developer convenience. You can switch between Developer Kernel Patches and Stock Kernel Patches.
With Stock Kernel Patches, a jailbroken device may be unable to boot when using stock kernel patches, so make sure your
/etc/fstab is set back to read-only for root.
Additionally, you can also choose to boot without snapshot mount. By default, the System partition is an immutable snapshot. Disabling the snapshot mount makes it easier to modify.