I tried to install ClockworkMod via ROM manager. My device(Innos A35) wasn't listed, but I chose one that was on the list thinking that it would somehow get installed. There was a download, but when I reboot to recovery mode the old recovery software with only a few options is shown. I was thinking that rebooting to recovery mode would bring up something like this if ClockworkMod was properly installed. Can someone point to me what could be wrong? Or can someone tell me how to manually install ClockworkMod without using ROM Manager?
Any recovery, be it ClockworkMod or TWRP, or others, must be specifically created for each device (or sometimes device family, if their hardware is similar enough) separately. Picking a random device off a list in ROM Manager will not work, and may even damage your phone.
Quick Google, XDA, and Rootzwiki searches don't bring up any relevant hits for "Innos A35" at all, so it's safe to assume that this device is not supported by any well-known recovery makers. This may be because the device is too new, or there simply is not enough interest in it from the Android developer community.