How I can create these files w810_p3k_dcu.49R.ssw & 2. rest_W810_R4EA031.bin?

Click [Add] button on SETool 2 Lite select the file according to your phone model, in my case, ‘w550_r2e_dcu.49r.ssw’ (for W550i CID49) .
I've read on other threats that I have to apply to my phone only firmware with the same erom cid as is on the phone,in my case cid 50.
If I apply w810_p3k_dcu.49R.ssw which has cid 49, the phone won't be damaged?