Install custom firmware or exploit-based homebrew
Use a compatible flashcart for homebrew and backups
Replace the shell or buttons for cosmetic customization
Swap the battery for a higher-capacity compatible battery
Replace the speakers for improved audio
Install a brighter or replacement LCD screen
Add a USB charging mod
Add a rechargeable battery mod
Install a region-free or language-unlock patch if available
Change the firmware theme or system icons if supported
Clean and reflow the buttons, contacts, and hinges
Replace worn rubber membranes and touch digitizer
Upgrade the Wi-Fi module only if using a compatible donor part
Add LED or backlight accent mods
Use a custom stylus, grip, or case mod
Backup NAND/firmware before making software changes
Verify compatibility of every part before opening the console