bad CheckSum [installation rockbox] on IPOD MINI 2Gen

[sbrigu]

i try to use rockbox utility but after select my Ipod not work fine,than i use manually mode.
I have in may Ipod root a correct .rockbox anc the 4 folder of default ipod, i install also a Font, and bootload with bootpatch. but when restart ipod i have:
BAD CHECKSUM
loading rockbox..
lenght: 6C2F0
.
.
.
.
.
can't load rockbox.ipo..

please help..

[zajacattack]

Someone else had a similar problem. Are you absolutely sure that it's a 2nd Gen. Mini?