Attached a zip archive with a copy of the 5big2 spi flash of Jocko
Extract them in the tfp folder of the fvdw-sl console and choose action flash u-boot in the fvdw-sl console and choose the file u-boot-5big2-spi-3416-1517.bin as file to write to flash
The console will check the md5 sum of the u-boot image using the second file with extension md5 intis package before uploading it to the 5big2 and writing it to flash, it will abort the process if md5sum of the file as present on your pc doesn't match with the number in the md5 file, meaning file is corrupt and writing a corrupt file to flash is a bad idea
Please note that we do not take any responsibility for using this file and writing it to flash.
Flashing u-boot always has a risk and if it goes wrong it might brick your nas.
When you decide to use this file and write it to flash, don't blame us if it goes wrong for whatever reason .