Failed to load os image on colibri imx6

Dear colleagues
I get this error when I put large file on flash disk:

Invalid image signature
Error: Failed to load Os image from SD/MMC
Info: OEMReportError Reason 0xfffffffa

Help me please

Are you talking about image size when refer to "large file? If so, please check this article https://www.toradex.com/community/questions/27040/maximum-image-size.html

How do you flash the image? Do you use bootloader commands, update tool or easy installer?