booting into custom recovery

[Guest svesh]

I have a stock y300 b182 firmware and have unlocked the bootloader. I am trying to boot into a custom recovery stored on my harddrive using "fastboot boot recovery.img". fastboot shows the image downloading and booting okay but the phone just hangs on the fastboot screen. I don't want to flash the recovery image yet because i want to backup the stock recovery. can anyone else replicate the problem?