Re: Error Upgrading ESXi 5.1 U1 to 5.5 U1 (or 5.1 U2, same error) - Could not parse VIB XML, 100-digit error code

hi

did you do an actual upgrade or new installation?

is there any custom VIB installed?

i think you just should install new esx 5.5 u1 and don't do an upgrade. you can keep the datastore if you want but if possible just do new installation.