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

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