Bricked Wrt1900acs v2

Hi All
I am hoping someone could help me out with a couple of files for Wrt1900acs v2 (Australian) I have searched and can not find the correct u-boot files for the router all the links i found are dead / removed for some reason.
u-boot-a38x-spi-uart.bin
u-boot-a38x-spi.bin
All help very much appreciated

Thanks Andrew

Takes a lot to brick u-boot.

  1. Are you sure you bricked u-boot?
  2. Have you connected up to the TTL serial console connection inside the router?

I am looking for the uboot files to suit this router do you have them ?
Thanks Andrew

iirc there are links to be found off the OpenWrt wiki on device page.

Thanks
The links are dead same as github

WFM ??

Thanks for the link i still get error any help appreciated.
I did read this error is because it's the wrong file can any one confirm this ?
Thanks

root@dono-C660:/home/dono/kwboot# kwboot -a -t /dev/ttyUSB0 -b u-boot-uart.kwb
Sending boot message. Please reboot the target...-
Sending boot image...
   0 % [......................................................................]
  0 % [......................................................................]
  1 % [......................................................................]
  2 % [......................................................................]
  3 % [......................................................................]
  4 % [......................................................................]
  5 % [......................................................................]
  6 % [......................................................................]
  7 % [......................................................................]
  8 % [......................................................................]
  9 % [......................................................................]
 10 % [............................. .l+xmodem: Protocol error
root@dono-C660:/home/dono/kwboot#   

This is the problem i am trying to fix

BootROM - 1.73
Booting from NAND flashBootROM: 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 00060000
BootROM: Bad header at offset 00070000
BootROM: Bad header at offset 00080000
BootROM: Bad header at offset 00090000
BootROM: Bad header at offset 000A0000
BootROM: Bad header at offset 000B0000
BootROM: Bad header at offset 000C0000
BootROM: Bad header at offset 000D0000
BootROM: Bad header at offset 000E0000
BootROM: Bad header at offset 000F0000
BootROM: Bad header at offset 00100000
BootROM: Bad header at offset 00110000
BootROM: Bad header at offset 00120000
BootROM: Bad header at offset 00130000
BootROM: Bad header at offset 00140000
BootROM: Bad header at offset 00150000
BootROM: Bad header at offset 00160000
BootROM: Bad header at offset 00170000
BootROM: Bad header at offset 00180000
BootROM: 
Trying Uart