Vol. down/power on for fastboot doesn't work - it gives the same error described in the first post (after the Huawei logo).
When the phone was first connected in pink screen mode, three devices were found and the drivers install OK - a USB Composite device, DBadapter Reserved Interface (COM10) and Android Adapter Modem
Clutching at straws, I tried the commands "adb devices" and "fastboot devices" in pink screen mode but they don't find anything.
I've read elsewhere that trying to unlock the boot loader on ICS has been known to brick some phones. Could this be what happened to mine? Although, as I say the phone was rebooted successfully after the unlock. In fact it worked overnight, the alarm woke me up this morning and I listened to mp3s on the way in to work.
EDIT: Good news, everyone! I downloaded the complete Huawei downgrade from http://www.huaweidev...softid=NDY4ODE= and it appears to have worked. Why my earlier attempt didn't work I don't know. Maybe a different version of the "middle" package.
I now have B895 and I think I'll leave it there for the moment. Maybe I'll give CWM a go when I'm feeling brave. For now, I've just got to restore all my stuff from backup...
Answering my own question from earlier, it appears the phone does not charge while in pink screen/recovery mode as my battery was down to 5%. Lucky escape there, then!
Huge thanks to everyone who offered help.
How exactly did you end up fixing it? I have tried many different ways with no luck as of yet.