geoghotas...
You are on the Preview for Developers. You have 8.1.1 we can all agree to that. It shows in your OS version number. Fine.
Denim is Lumia Firmware (just like Cyan) and Lumia Firmware CAN NOT, WILL NOT, WON'T EVER be part of the P4D program. P4D lets you Beta test advances in the core OS. Firmware brings advances to your specific hardware and optimizes the core OS to run on your device.
You don't have Denim. You can't have Denim. Denim has not rolled out for ANY 1520 anywhere in the world. If any 1520 has it, it would be a developer phone for use by Lumia engineers building firmware and that phone would be linked to an exclusive and secure Lumia server for in-house use only. No one outside Lumia would have access to that Beta firmware. Under penalty of copyright violation.
The rich camera and other tweaks you are looking for are still in the future for the general 1520 user population.
If you got on the P4D program to get Denim, you are only fooling yourself. If you are not qualified to act as a Beta Tester and do not understand the program, you really should not be on it. Revert your phone to stock 8.1 + Lumia Cyan and wait patiently. Denim will roll out when it does and no sooner.
Don't post your IMEI on a public forum. There are people out there who clone phones and you put your device at risk in other ways as well.
Why do you think your text conversation and phone call history prove you have Denim? Why post that at all?
Slow down a moment and read up on some things. Research should come before action, not simultaneously. Modifying your phone without understanding the mod is never a good idea. This is not Android, filled with hacks and shortcuts. I would hate to see you bork your new phone because you want it to do things it simply will not.