HP LaserJet P2015
When I click into the printer section where supposedly it should give an option to upgrade the 600 dpi up to 1200 dpi, this is not available as an option.

How to Identify and Fix Common printer Problems ?

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This compact, black-and-white LaserJet printer lets workteams produce professional-quality documents at true 1200 dpi, on demand.
So a 1200 dpi printer uses 1200 dots of ink in every inch to make up the colours. If you were printing a 300 PPI image, then every pixel would be made up of 16 smaller ink dots (1200 DPI x 1200 DPI / 300 PPI x 300 PPI). A lower DPI would have fewer ink dots making up each pixel, which would make the colour look worse.
Go to the Printer driver > Printing Preferences > Advanced > Printer Features > and then Max. Application Resolution. Choose the requested DPI settings.
Select Start > Settings . Go to Devices > Printers & scanners > select a printer > Manage. Then select Set as default.
From the Home screen on the printer control panel, swipe right to navigate, and then touch Reports. From the Reports menu, touch Configuration/Status Pages. Select the Configuration Page item, and then touch the Print button to print the Configuration pages.
The best print speed for everyday prints (medium quality) is about 50–60 mm/s. However, users should note that some materials can be printed very quickly (e.g. PLA) while some require a slower rate to prevent warping or print failure (e.g. TPU).
In general, however, a print speed of 12 pages per minute (ppm) is considered good for most home printers. For office printers, a print speed of 20 ppm is typically adequate. However, if you frequently print large documents or photos, you may want a printer with a higher print speed.
Press and hold the GO button. All lights turn off. During the next three seconds, the GO, Ready and Attention lights turn on in that order, one per second. Release the GO button to perform the initialization.
Open Command Prompt by pressing the Windows key and typing cmd. Type netstat -r. Press Enter. You will now be able to see a list of network devices connected to your computer and your printer`s IP.
The higher the dpi the better the resolution and the better copy/print quality. For example, 1200 X 1200 dpi will give you better resolution or copy/print quality than 600 X 600 dpi, thus giving you better copy/print quality and better half tones.
Resolution dpi = (pixels of length) / (inches of length)

Suppose our image is 1200 pixels wide. Contemplating printing it, we see that we could print this image at several different sizes, simply by changing the scaled resolution: 1200 pixels / 11 inches = 109 dpi. 1200 pixels / 10 inches = 120 dpi.

HP Wired Mouse 100 with 1600 DPI Optical Sensor, USB Plug-and -Play,ambidextrous Design, Built-in Scrolling and 3 Handy Buttons.
HP X200 Wireless Mouse

Also, you can switch its DPI between 800, 1200, and 1600.

Relevant Questions and Answers :

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HP LaserJet 1200 Early Feeding Causes Paper Jam
ANSWER : Seriously, dmzcompute, you are awesome! And this is just what the internet does so well: a specific fix for an esoteric problem, thus keeping a 15 year old machine alive another day. Thank you!

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HP LaserJet P2015

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ANSWER : Pull and reset the fuser. Make sure both sides are back into their position.

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HP LaserJet P2015

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ANSWER : To initialize: turn off – Press start and hold down while turning on, release after all three light light, you should see initialize disk hit check, and allow to boot.

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ANSWER : You can replace it by finding the slot of DIMM, where the existing HP4550N formatter board is installed. More info is available here

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HP LaserJet P2015