The request was the following:
1) make sure CF card is empty.
2) copy gupdate.gcd from dumper-0.20.rar to CF:/garmin/gupdate.gcd
3) copy new.bin from dumper-0.20.rar to CF:/new.bin
4) flash gupdate.gcd
5) send CF:/new.bin to me

And similarly with exst.bin and dumper-0.21.rar. Did you do it like this?