These instructions have been performed on EMC VNXe 3100 but should also be applicable to EMC VNXe 3150 and 3300.
- Login to VNXe Unisphere;
- Settings > More Configuration… > Update Software;
- Click on Obtain Candidate Version Online, you will be redirected to EMC Online Support website where you can download VNXe Operating Environment firmware file to your PC
The file extension is .gpg
Only my storage admin has this memorized…