Non-rooted flash to ICS works
Thanks for the info. I upgraded w/o ever connecting to a pc, or even having a sim card in, while connected to wifi. Stock Rezound, post fresh factory reset.
The links from the following page (with incomplete directions) http://www.androidpolice.com/2012/03/16/exclusive-download-android-4-0-build-3-11-605-22-for-the-htc-rezound/ wouldn't connect to working download pages, so I typed this address into Rezound browser:
http://i.minus.com/mbfFf1ZHwR/gallery.zip
Downloaded file, then with Astro - moved it to / of sd card2 and renamed it PH98IMG.zip, double checked md5.
Rebooted phone with vol/dn and power, it ran once and rebooted into an apparently working phone, but phone info still showed old firmware.
Rebooted phone with vol/dn and power again, it ran with all the checkmarks updating, then rebooted into upgraded phone.
Somewhere I read, and it seems to work: reboot phone while plugged into wall charger, then press and hold vol and power when charge light goes out momentarily - gets into recovery w/o battery pull.
Post upgrade, It seems like maybe the wifi isn't working on wpa2-psk security??, but it does connect to open network.
Thanks again for the more complete instructions posted here.
Now I think I'll jump into unlocking and nandroid, then flash cleanrom or such.
Bob