Anyone tried using this or similar?
 

BMW Dis V57 SSS V32 Tis V8 GT1 Inpa Ediabas Diagnostic Dealer Software Cable | eBay

Need to get some sort of diagnostics to trouble shoot the rear tailgate issues.

Thanks

I have one of these from the Romanian cable guy, they work pretty good, maybe not too great for software upgrades as I had some issues with that, but other than that they work well! I don't know if this will help with your tailgate issues though...