Hi there.
Its a pity but having same problems with HTC Legend (Android 2.1) as with Samsung Galaxy i5700 
A simple scene only uploads and work with Universal-experimental settings.
With - Arm7 recommended have - Unable install APK
with Arm6-Arm7 autodetect - just not running at all
Help!
HTC Legend is based on Qualcomm MSM7227, and as such not a Cortex/ARMv7 processor (but instead an ARM1136EJ-S core). It’s not supported, and there is no ‘help’.
But it would be interesting to know what kind of framerate you get with the Universal/Experimental setting on the Legend…
Yep, its Armv6 as i know. But so why its not working with second option - “Arm6-Arm7 autodetect”?
Sure, ill post results of tests and framerate figures 
Because it is not generic ARMv6 autodetect - it’s ARMv6 with VFP, something the Legend is missing. But please consult the documentation before making assumptions like this. It’s clearly stated there that the autodetect feature is only a packaging detail - we take the ARMv7 binaries and package them in a way that the .apk pretends to support all Android devices but then at runtime autodetects if we really do. As I explained here the autodetect feature is mainly to support Nvidia Tegra based devices, as those are (currently) configured to not support .apks with ARMv7 binaries.
The Universal/Experimental option is only there to add (some) support for the Andorid Emulator, but has the “side effect” of making it possible to test Unity on non-VFP devices.
I see now. Thanx for good explanation.