If you read the documentation on the 09.2B.80 update it says: WARNING: After successful PSU FW Update on PSU PN: 5NF18, PSU FW Version shall be 07.2B.80 So, prior to the update, my power supplies had version 07.2B.7D and after the update they have 07.2B.80. This means that they have in fact been updated. However, because the package version is 09.2B.80, things like OME will still say they need updating because version numbers do not match exactly. Dumbest thing ever and annoys me completely. All the time I wasted trying to get it updated when it already was. www.dell.com/.../DriversDetails 
I'm running OME v2.0 and it reported we needed to apply a critical update to our 750w power supplies on our R620 servers (Power_Firmware_JX7PR_WIN64_09.2B.80_A00.EXE) I've installed the update on 2 of our R620 servers and did not receive any errors.  After the update process completes (and multiple reboots), it still shows the older firmware (v07.2B.80) is still installed. Curious if anyone else has had this problem or successfully updated their power supply firmware.
Firmware update for R620 750w power supply