Checking the system requirements section for Android based mobiles, the HTC Legend is not listed as a compatible phone for the standard Fennec builds. It does state that the experimental ARMv6 nightly builds may work on the HTC Legend. For more details including a download link see https://wiki.mozilla.org/Mobile/Platforms/Android

With the latest download it seems to be working on HTC Legend with Android 2.1 OS.

Fwiw, it doesn't honor the G-sensor (gyroscope).

What this means is that when you tilt the phone to go to landscape mode, Fennec doesn't follow suit. It also doesn't adjust the width of the pages to suit when you're in portrait mode, either.

Consistency of keyboard usage when an input field has focus is not useful, either. Additionally, it uses an autoguesser when you're typing in a web address which again, isn't appropriate.

I had used the latest apk, but it did not work

Yes, I had tried using ARMv6, though the browser does not crash, it is quite slow The UI goes zagged while browsing.