O.K. I don't know if it helps you, but I will note that down here, maybe someone else has an idea:
First things first:
I FIXED IT!
First the scenario on my phone.
1) GB backup
2) ICS backup (Orig Huawei update)
3) CM 10 (JB)
4) Vodafone NZ ICS update
1 and 2 were not bootable anymore
3 and 4 were bootable
(And I had an IMEI backup from GB times)
I used the IMEI method of "deleting" my IMEI, then put the Vodafone update on my phone (and restored my IMEI).
Seemed like nothing has changed, ... except:
I was able to boot into backup 1 backup again!
And then I tried to boot into my first ICS (backup 2) and guess what 3G worked again!
The point is: I haven't figured out why backup 1&2 were not bootable before, but 3&4 were, and why this now changed and is the other way around now!
I might have done some other stuff before installing the NZ image (like wiping all data, fixing permisions, wiping dalvik cache etc), but I have done most of that before and it hasn't worked.
So my guess is: The NZ image (OTA update in dload-folder) has the ability to fix our issues, but first you have to prepare your device somehow to let the OTA beeing able to fix it.
Sorry I couldn't help more, but because I didn't realy think that would help this time, I wasn't writing down what I did, and I did so many things to this phone in the past 72 hours, I am impressed that it still works!
If you have any questions, please ask, but make them detailed and ASAP, as my memories will fade over time. :-(
C ya! (Now happy!)
Edited by smartbyte, 11 September 2012 - 01:48 AM.