Yes kunix, i didn't want to spam this thread whole last night, cause i exchanged manny pms with lolypop, he gave me idea to flash with 4.50 firmware, he prepared 4.50 firmware with pk66_files and flashin finally was finished 1st time during this situaton with 765, but again after flashing message "system software is missing", then lolly prepared another firmware with 600 at end of .rgn file's name, and it flashed file very long, about 55 minutes, i hoped that will erase internal memory, to be like a FAT - mass storage recognized, but at all again after this long flashing with GarminCure3, when i wake up this morning, saw message "system software missing", i worked last night on this problematic device to 2 o'clok after midnight , i'm not sure is flashing with modified lolly's firmware finished ok, cause i slept on 50% progress , was so tired, of trying, i'll try it again today, and will inform you!