Arduino as WINBOND W25Q*** SPI Flash (used for modern PC mainboard BIOS) reader/writer
It's slow (for 16 Mb flash @ 115200 baud it takes about a hour), but simple to build, need no special software and does the work.
To work with the programmer use any terminal emulator with X-Modem transfer support (e.g. hyperterminal.exe) at 115200
WINBOND -- Arduino
1 -- 10
2 -- 12
3 -- 3.3V
4 -- GND
5 -- 11
6 -- 13
7 -- 3.3V
8 -- 3.3V
Don't connect any pin of the chip to 5V instead of 3.3V, this will probably kill the chip.
0 - initialize
r - read content
e - erase all chip (must be done before write)
w - write content