XO1/os31 update-nand issues

Fri Mar 23 02:54:21 EDT 2012

Tried to update 2 unlocked XO-1s running firmware q2{e49,f06,f08} from ext3 USB or SDcard. 
"update-nand {u, disk, ext,sd}:\os31.img} freezes after the newline return without further feedback.
>From SDcard the XO restarts after ~20 sec while from USB stays there for up to 10 min.
md5sum check out and os31.crc is present.
If os31.img, .crc are know to be good, anything to check/diagnose?