RN2120v2 nand flash accidentally erased

Hi All,

i was testing a new kernel on my 2120v2 when i accidentally erased the nand flash used for boot. 
This is a nas i use for testing so there is no data lost, but i would like to bring it back to life if possible.

I know uboot can be sent over uart on this machine, but recompiling uboot and sending it over uart don't work, i guess the uboot was a NG custom version?

Does anybody know where i can find an original copy/backup of the flash nand for this rn2120 (arm)?

Thanks!

Sandro