Downgrade from BIG-IP 10.2.3 to 9.4.7

I have a few suggestions:

 

 

1. To create the 9.4.7 USB drive, I have found that it works best when done from a unit that is already running 9.4.7. Your problem might be the fact you are trying to make a 9.4.7 usb drive on a bigip running 10.x code? Example: In my lab, I would use a box running 9.4.7 to create the 9.4.7 USB drive using the 9.4.7 IM file.

 

 

2. Even though its specified that the mkdisk utility is used for version 9.4.7 and up , which in your case, you are going to 9.4.7, so it should work, I would also try the umdinstall utility.

 

 

"Beginning in BIG-IP version 9.4.7, the umdinstall utility is no longer supported and has been removed from the BIG-IP installation image files. F5 recommends using the mkdisk utility on a BIG-IP system or a Linux-based system to load a BIG-IP installation image onto a USB mass storage device."

 

 

 

3. I have found that some USB drives work better than others. (I have had good results with kingston)