flasher dongle design

can anybody give me a flasher dongle design, both schematic and pictorial and pcb, for dct3 phones. my 3210 flasher cable has ceased/cannot flash 3210s anymore. it gives out this error on rolis: Buffer too small even for MCU CHK test. i already tried everything from increasing, decreasing index to formatting my hard disk.

i bought a new cable but it still gives out that error. is it dongle-related? should i change the ic? what ic should i use? how do i modify the dongle? it works on every other nokia models except 3210. pls. help me out.

thanks