And if you ever see "Partition check failed" – the NAND is likely dying. The 30D is known for this after ~7–10 years.
This method fails on 50% of 30D units because the NVRAM gets corrupted. If after reboot you still cannot log in, proceed to the Console Method . fortigate 30d factory reset
You stay on the same FortiOS. If you want a , you must: And if you ever see "Partition check failed"