Hi, Try this version of the update and see if that works. It specifies it is for the 1950.
We have 6 PE1950 servers with SAS PERC 5/i Integrated RAID controllers. Dell OpenManage is complaining about the PERC firmware being out of date. Of the 2 servers I currently have running, one has firmware 5.2.1-0062 and one has 5.1.1-0040. I have downloaded the latest version of 5.2.2-0072. I tried updating thru the Windows package and that failed, along with it complaining about the OS being too new. One server is Windows Server 2008 R2 and the other is Windows Server 2012 R2. So then I created a DOS USB stick with the hard drive files from Dell and ran update.bat. That failed on both servers with the following errors: Firmware failed to FLASH flash. Stop!!! The Firmware update failed for controller 0 The Controller Firmware update process failed!!  Both servers had the exact same errors as shown above. Any ideas about how I can successfully get the firmware updated? I verified that the package I downloaded is for the PERC 5/i Integrated.  It is the one here (if this will let me post a link):  www.dell.com/.../DriversDetails 
Unable to upgrade firmware for PERC 5/i on PE1950