CFE for RT-AC5300

[asusfr33k]

I know how to back up booloader file with the dd command but stupidly me I forgot to do that before flashing asuswrt-Merlin. Does that file get touched in any way once I upgrade to Merlin and if so can I get my original cfe file by flashing Asus stock back?

Thanks

 

[RMerlin]

My firmware does not make any additional change to CFE.