Currently, if the system doesn't boot completely, we can only erase/backup NV using SD card (and boot.bin patch sometimes).
It would be nice to recover only the most important NV records and erase the others. But it can't be done currently, as NV format is unknown.

Quote Originally Posted by catymag View Post
Kunix sent me a program to restore them but failed. Probably it works with 1XXX series.
For 37xx/34xx you would need a service USB cable... It's not hard to make it...