Although the instructions for upgrading the Sony Ericsson Xperia Arc (not the new S version) are pretty detailed there are some twists that are not documented:

My ADP1 has been running Android 1.6 (Cyanogenmod 4.2.x) for quite a while now, and I was exited to see that it would be possible to run Android 2.1 on it thanks to Cyanogen :). This guide is a digest of information found on Cyanogen’s wiki, like: ADP1 Firmware to CyanogenMod, please consult the wiki for up todate information and warnings :)

I’ve been putting off upgrading my ADP1 in fear of that I would brick it, but after reading that there now are official update images available I decided to give it a try.

I have been playing around with my Android Developer Phone (ADP) for about 2 weeks now, and this are my thoughts on it so far.

Finally, my HTC G1 Dev Phone running Android OS has arrived!