Just modified my original response.
In case of an RMA, you might indeed want to flash the backup back. This comes with two risks, actually:
1) Is the backup you made OK?
2) Will the write process of the flash work or does your flash developed an error, which might void the flashing process?
In both cases you might be left with a bricked device.
I don't know how to write back the flash backup.
Doing the hack in reverse order is safer, but there will be leftovers from SVA, which Siglent can easily detect.
Regards,
Vitor