Thats fine. I do not know why reading the check file fails but because the content of the md5check file is oke, it contains the correct md5sum we can also proceed manually instead of using the auto flash feature
To do that you need to switch of 5big2,
start fvdw-sl-console,
chose as action start tftpd server (check that it is really started, tftpd window should pop up)
After thatn chose as action uboot console.
After that start the 5big2 and connect to uboot as you have done previously, you should get the marvell>> prompt.
Behind the marvel prompt type
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setenv ipaddr ${ipaddr};setenv serverip ${serverip}
after that start uploading the bin file and start flash
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bubt u-boot-5big2-spi-3416-1517.bin
this should result in an action that the file is uploaded via tftpd server to 5big2 ((459.732 bytes should be transferred) and flash starts
It will unprotect the flash monitor space and comes up with a warning and question to override env parameters
Answer no (n) to that question
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n
After that erase of flash memory will take place and it will copy the bin file content to flash and protect Flash monitor space again
Remove the protection to be able to modify later the content
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protect off all
If everything went well reboot the nas by command
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reset
In fact this is what the console will do after it has checked the md5 sum (see also the screenshot in help page for flashing uboot
If you have a flash failure or there are not 459.732 bytes uploaded by the bubt command do not perform the reset command !