NSA325v2 u-boot installation problem (4 replies)

Hi guys!
Yesterday night I tried to update u-boot on my NSA325v2 with stock firmware.
I followed all of the instructions until the step 8.b and I forgot to do the step 8.c:

fw_printenv > current_envs.txt

I went on until:

Quote
bodhi
Then for all boxes, restore these 2 envs using the saved envs text in step c (replace xxx with the real saved values)

fw_setenv mtdparts 'xxxxxxxxx'
fw_setenv ethaddr 'xx:xx:xx:xx:xx:xx'

Luckily I saved my mtd0 and the environment at step 3:

Quote
bodhi
Dumping NAND mtd0:

nanddump --noecc --omitoob -l 0x80000 -f mtd0 /dev/mtd0

Save envs:

fw_printenv > current_envs.txt

The problem is that I stored the last files in the hard drive of the NAS (configured in RAID 1).
Finally at step 8.f, thinking to still reboot with the stock firmware, I used

fw_setenv dtb_file

and rebooted the NAS.

Now, the NAS doesn't boot, but I have an active serial console.
How can I boot the stock firmware (preserving the new u-boot to install debian in future)?
If I boot the stock firmware I will be able to access to the environment file stored on it and set the right mtdparts and ethaddr.

Thank you for help!

Ivan