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after exchanging the loader system will not boot, you will have to use the synology assistant to fix it, only takes a few seconds main reason imho is that the fresh loader 1.02b comes with the kernel of dsm 6.1.0 (15047) and you usualy have a newer dsm/kernel installed like 6.1.3 (15152) its the same as if you get your real synology hardware exchanged, you take out all disks, get a new diskstation delivered and there will be a difference between the internal synology usb loader and your disks, that has to be fixed i've not tested it but it may work ootb if you copy the "recent" (latest installed) zImage and rd.gz to the boot media thats not always inside the big 200 GB "first" pat file, you have to check the last update pat file, if there is a flashupdate package inside (open pat files with 7zip) like "flashupdate_6.1-15152-s7_all.deb" the this contains the newer files (can also be opend with 7zip) you need to copy the two files to the 2nd partition of the image (if windows 10 is used that can use the 2nd partion easily as it gives it a drive letter when connected)

You can exchange the loader 1.02a with 1.02b. You just have to make the same changes of the mac-address and sn in the config file as usal. Have a look into the "how to-threads" here. There will be explained the process.