RN2120v2 bricked (2 replies)

Hello Everyone,
i hope someone can help me..
I was playing (yes.. my bad) with my RN2120v2 u_boot and kernel image to see if i could update debian to a more recent version, the ultimate goal was to install Nextcloud on this hardware, and somehow i bricked everything.
It all happened when trying to erase the mtd partitions i typed .chip instead of the one for the partition. (it was late night..)
All i get from serial when i press the power button now is :

BootROM 1.20
Booting from NAND flash
BootROM: Bad header at offset 00000000
BootROM: Bad header at offset 00010000
BootROM: Bad header at offset 00020000
BootROM: Bad header at offset 00030000
BootROM: Bad header at offset 00040000
BootROM: Bad header at offset 00050000
....
BootROM: Bad header at offset 012A0000
BootROM: Bad header at offset 012B0000
BootROM: Bad header at offset 012C0000
BootROM: Bad header at offset 012D0000

But my problem is not this. I read other topics and found out it is possible to get u_boot transferred over serial and from there i can restore the mtd content (which i don't have..),
so i tried to use kwboot with different images (RN104), which i suspect don't work because targeting a different cpu
I then tried to download from NetGear the source code from:
ReadyNAS OS 6 (RN102/RN104/2120) thinking i can get u_boot from there and recompile it (i did this before for other boards).

But i couldn't find any u_boot in that package! It seems the package only provide sources for the kernel and OS.
Am i missing something here? I also searched for this version over the net and it seems very hard to find.
The u_boot version is this: (from a serial dump before the mess)

BootROM 1.20
Booting from NAND flash

General initialization - Version: 1.0.0
High speed PHY - Version: 2.1.8  (COM-PHY-V22)
Update Device ID PEX0782311AB
Update Device ID PEX1782311AB
Update Device ID PEX2782311AB
Update Device ID PEX3782311AB
Update Device ID PEX4782311AB
Update Device ID PEX5782311AB
Update Device ID PEX6782311AB
Update PEX Device ID 0x78230
High speed PHY - Ended Successfully
DDR3 Training Sequence - Ver 5.7.1
DDR3 Training Sequence - Run with PBS.
DDR3 Training Sequence - Ended Successfully 
BootROM: Image checksum verification PASSED

 __   __                      _ _
|  \/  | __ _ _ ____   _____| | |
| |\/| |/ _` | '__\ \ / / _ \ | |
| |  | | (_| | |   \ V /  __/ | |
|_|  |_|\__,_|_|    \_/ \___|_|_|
         _   _     ____              _
        | | | |   | __ )  ___   ___ | |_ 
        | | | |___|  _ \ / _ \ / _ \| __| 
        | |_| |___| |_) | (_) | (_) | |_ 
         \___/    |____/ \___/ \___/ \__| 
 ** LOADER **


U-Boot 2011.12-gd923454 (Sep 08 2015 - 18:59:32) Marvell version: v2011.12 2014_T2.0p1
Netgear version: 09/08/2015 ReadyNAS-2120 v2.0

Board: DB-78460-BP rev 2.0
SoC:   MV78230 B0
       running 2 CPUs
       Custom configuration
CPU:   Marvell PJ4B (584) v7 (Rev 2) LE
       CPU 0
       CPU    @ 1600 [MHz]
       L2     @ 800 [MHz]
       TClock @ 250 [MHz]
       DDR    @ 800 [MHz]
       DDR 32Bit Width, FastPath Memory Access
       DDR ECC Disabled
DRAM:  2 GiB

Map:   Code:		0x7fedf000:0x7ff9f204
       BSS:		0x7ffefc20
       Stack:		0x7f9deef8
       Heap:		0x7f9df000:0x7fedf000

NAND:  128 MiB
MMC:   MRVL_MMC: 0
Bad block table found at page 65472, version 0x01
Bad block table found at page 65408, version 0x01

Initialize and scan all PCI interfaces
PEX unit.port(active IF[-first bus]):
------------------------------------------
PEX 0.0(0-0): Root Complex Interface, Detected Link X1, GEN 2.0
PEX 0.1(1-1): Root Complex Interface, Detected Link X1, GEN 2.0
PEX 1.0(2-2): Root Complex Interface, Detected Link X1, GEN 2.0
FPU initialized to Run Fast Mode.
USB 0: Host Mode
USB 1: Host Mode
USB 2: Host Mode
Modules Detected:
Net:   egiga0, egiga1 [PRIME]
Power On!

Another problem i have when i try to send u_boot.bin over the serial is that on this machine i have to keep pressing the power button for the entire time (1+ hours..) until the image is downloaded, otherwise the power button lights up the power on led for only 2 seconds. Is this common on other models?

So at the end my question is: is there anybody so kind to point me to where the u_boot for this particular board could be? Or if anybody owns a 2120 would be so kind to dump the mtd partition for u_boot and post it here?

Thanks a lot!
Sandro