I can't change pid 7601 :-(
I do all that you write. But no errors.
ubuntu@ubuntu:~$ sudo iwpriv ra0 e2p 20a=3572
ra0 e2p:
[0x20A]:3572

If I restart system see the same pid:

ID 148f:7601 Ralink Technology, Corp.

What can i do?
I need VID 148F PID 3572