custom recovery isn't installing after unlocking bootloader in CM 12 S Yureka topic

Hi All,

I'm facing a critical problem. I have unlocked the bootloader using

Code:

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fastboot -i 0x1ebf oem unlock

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. I also ran the flashing CWM command in terminal

Code:

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fastboot -i 0x1ebf flash recovery CM_Yureka_Recovery.img

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. Which went succesfully as it shows messages like:

Code:

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sending recovery...OKAY...writing recovery...OKAY...finished. total time 0.440 secs..

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. But when I reboot into recovery mode, the cyanogen default recovery was there not the CWM recovery. Then I went to flash the SuperUser zip file browsing from sd card. Please note, that Internal/External I tried both. But its shows the typical signature verification failed error. I'm facing this problem on CM 12S. On CM 11s the whole rooting process went so well. So what should I do now? Need help ASAP. Thanks in advance.