: This is the highest supported mainline for the
"CPU spikes to 100% after upgrade." Fix: This is often the ipsengine going haywire. In CLI, run: diagnose test application ipsmonitor 99 If it crashes, disable "Redline" protocol decoders in your IPS sensor. Fortigate 100d Firmware Download BEST
Do not jump from an old version (like 5.4) straight to 6.2. This can corrupt your configuration file. : This is the highest supported mainline for
Additional resources (official)
Disable SSL VPN, use only IPsec VPN, or isolate the 100D to a non-critical VLAN. use only IPsec VPN
Once this date passes, technical support and firmware access via official channels typically cease.