First solution for "nokia 3610 but with blank lcd, sometimes its doesnt work if u flash it with 3610 file so:
1- flash ur nokia 3610 with nokia 2100 files use 479/8select 5210
2- your phone become CS
3- use noktool 19i update faid & change imei
4- use eeprom tool ver 4 update
5- viola your 3610 become 2100 with security keylock
Second solution is upgrade 5210 become 2100
1- backup your phone use rollis 479 select phone is 5210
2- flash it with nokia 2100 files, ur phone become CS with beautiful LCD
3- use noktool, update faid change imei, than use eeprom tool4
4- Change your LCD with 3610 LCD. thats all
3610 & 2100 5210 its a same. different is nokia 5210 have ir
cable is 8210 cable