Today I've tried to upgrade my HP N40L Microserver but the onboard nic won't work anymore. I want to rollback to DSM 6.2-23739 Update 2. I've tried the following;  Flashed my USB with the latest bootloader 1.03b and starter the NAS. The NAS is reachable but only has the recovery option, but after the recovery the nic isn't reachable again.   How can I force the install to use  DSM 6.2.1-23824, and hopefully without any data loss only config loss.