Hi alka,
hi Flupke,
are you sure that you have performed the "Factory Set" routine from the SX Test Program properly (as stated in the information I gave you via PM)?
Was "Force Format Mode" actually displayed in the LCD after the first restart, and did this mode then run completely?
To the best of my knowledge, if "Factory Set", including "Force Format Mode", is performed properly, then EVERYTHING will be erased and EVERYTHING will be reset to the factory settings. I can't imagine that there could still be an old search index on the device.
Maybe you just repeat the Factory Set procedure again (exactly according to the instructions in the relevant PDF). You may have overlooked something important and therefore NOT all memory areas of the SX were deleted / reset.
Best regards,
Chris