You must have a Flash Backed Write Cache (FBWC) module (minimum 512MB) installed to use these features, even with the updated firmware. 2. Features Still Requiring a License

The market reality for the P420i is that official keys are cost-prohibitive relative to the value of the hardware. Many users in the community opt for the lower-cost keys found on secondary marketplaces (eBay/Amazon) simply because the hardware is obsolete and the official licensing infrastructure has moved on.