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Hi TerryWang,
One negative that I experienced from an ISTEP upgrade in October last year was that it knocked out the "comfort access" that I had configured through Bimmercode.
The long doors on the M2 mean that it can be awkward when getting out in confined spaces (like our garage), so we had configured the seats to move back when the car doors were opened.
When ISTEP was upgraded, it erased this (which it has done before), but when I went to reinstate it, I found that Bimmercode was unable to program this. I contacted the developer and he advised that BMW had move the codes and he hadn't been able to locate them. I tried again in February, but no change unfortunately.
The most unfortunate part of all this was that I didn't think that the upgrade was worthwhile: I had read that the DCT changes were better, particularly at low speed (in low gears), but I wasn't able to detect any improvements.
Cheers,
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