Samsung S6810 model as custom recovery file is in tar format so you can easy flash it using odin, file consist of tar and odin so extract it and flash it via odin easily, those who say after flash it wont show on recovery mode i have same problem before but after flashing this it fix it really works so you can now flash it without using terminal or etc its very easy just open odin click pda select recovery.tar, put you phone in downloading mode by power off, press vol down + menu and power at same time, then vol up to continue it work on original device for MTK china user dont try... best of luck 