ROM upgrade error 228

[legag]

Hi,

I'm a usual reader of your great forums. But, for today, I have a real question to ask to community ...

I'm trying to upgrade 2 pre-production products. Artemis and StarTrek.

For both, I receive an error message at 2% of the upgrade :
ERROR [228] : INVALID FILE SIZE
The image file is corrupted. Please check your update utility.
IU2.

I'm tested on 3 computers, with latests releases of Activesync.

I assume the trouble is because I have a pre-prod ROM, with bootloader 0.78.

What should I do ?

Thanks for your help.