So in the 2826 folder you used the ramloader (Ldr.bin) from the DS51's fw is what i think you're saying . If that's what you mean then yes, likely it is fatal if the pictures in your previous Post #52 are representative of that flashing.

How is the device behaving now? Does it turn on at all with feint light screen (check in very dark room), or does it start to boot but turn itself off/bootloop/stall on logo screen.... or is there no reaction at all to the power button on either short or long press?