The U8180 phone I got from my local Optus store yesterday was refusing
to root with GingerBreak-1.20. Applying the update that Paul uploaded
 solved the issue.
For completeness I've attached a screen capture showing the About
Software screen before and after the update. The only noticeable
difference on this screen is the build number.
Other things I've noticed is a change in the icons in the application
drawer. As my main interest in the phone is for development I didn't
take that much notice before flashing it.
As GingerBreak is technically using a software exploit to achieve our
desired result, the installation of the su binary, it is possible that
in the more recent builds of the ROM the exploit has been fixed.
> So I am busy getting our software onto 50 new U8180 phones we have
> bought, and in the process found that some of them won't root using
> Some of the ones that wouldn't root have a slightly different baseband
> version, but not of the actual OS, but some claim to have exactly the
> same version.
> I am now trying to put a stock rom on these phones so that I can try
> rooting from that, in the hope that it is an old enough rom to be
> vulnerable to GingerBreak.
> The instructions require putting a special big file (UPDATA.APP) (an
> official Optus firmware image for the U8180) into a special place on
> the sdcard (/sdcard/dload/UPDATA.APP). That bit was easy.
> The next bit said to hold power, volume-up and the red button. This
> is tricky, since there is no red button on the U8180 / IDEOS X1 /
> IDEOS Gaga.
> However, it turns out that holding volume-up and volume-down while
> turning the phone on does the trick.
> It then goes through the firmware update process (allow a few minutes).
> It then roots fine with GingerBreak-1.20. This is helpful, to say the least.
> We will put the UPDATA.APP file up on
> developer.servalproject.org/files as U8180-UPDATA.APP in case anyone
> needs it.
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