Some Buttons of Olympus 570 UZ camera do not work.

This is probably the kind of repair that should only be undertaken by a qualified artificer, unless you possess the elaborate equipment required for calibration of the camera.

No. This camera works with xD Picture Cards up to 2GB in size.

Make sure you have the switch turned to "take picture (camera)" instead of "reveiw photos (green triagle)". On this one, i think it is a wheel on the top of the camera.

Only thing I can think of...

-Mark

This is called "white balance"-- the indoor lights have a bit of a yellowish tint, while sunlight has more of a blue tint.
Try changing the white balance to Auto-- if you get bad results on Auto, try using the Indoor or Incandescent settings. You may have the white balance set on the "outdoor" or "flash" setting.

From SP510 camera switched off:
1. Turn dial on top plate to movie mode (selections from the menu screen apply to the mode the camera is set in);
2. Switch on SP510 power;
3. Press "MENU" button on back plate;
4. Select "Camera Menu" from screen if not already on it, using navigation buttons on back plate
5. Scroll down yellow "Camera menu" tabs to microphone picture (below "Digital Zoom"), which may be showing "off". Select OK and toggle yellow tab from "off" to "on", then press OK button.
6. Microphone tab should now show "on".
7. Return to main menu (press MENU button).
8. Return to image screen (press MENU button).
9. Test to see if video now records sound.
10. If is still doesn't record sound, try "reset" from video menu screen (this will reset the movie mode to factory settings, including microphone on).

Sounds like a repair issue with the image processing chip in the camera. You may want to call Olympus Customer Service to discuss repair options and pricing. Their telephone number is 800-622-6372 option 2 and then option 3

install drivers

focus issue... the camera tends to focus in the middle... try changing the scene mode to see if it gets any better

memory card... check to see if your card reader firmware can be updated... older card readers cannot not read 1 or 2 gb cards

Unfortunately such conversion is not possible. If the "vari angle" screen is an essential your best approach would be to dispose of the SP 550 UZ and buy another camera meeting your need. Sorry!

Assuming your SP 550 UZ is similar to the 510 UZ "RAW Mode" is not available in "Auto" or any of the "Scene" modes. If you set your camera to "P" and then access the Image Quality item in the Menu RAW is available as an option.
Hope this helps.