As you may know,many K850's suffer from BROD.The only way until now was to flash with SEUS,and lose everything,but now we have another way,which can be done in 5 minutes and without losing a thing.
To begin with,we need A2Uploader and an K850 FS,which we will have to extract it...Then,search for BOOT folder,and find the files inside that folder...Then,use A2Uploader,delete the files of the BOOT folder being in the phone,and upload the new ones...Voila,your phone is fixed!:cool: