E5810B bricked

[JiriB]

Hi.
I bought the used E5810B. Boot ended on "Initializing ..."
After playing in "U-Boot" I overwritten the U-Boot section in NVRAM (run up_uboot). My stupidity
To fix U-Boot using x-modem I do not have the original u-boot.bin file.
I can't get u-boot.bin from firmware file E5810_B_LATEST_FIRMWARE.HEX.
Don't someone help me?
Does anyone have experience with bricked E5810B?
Does anyone have a dump of nvram (there is no JTAG connector on PCB)?

Thank you.

[JiriB]

When no one helped, I helped myself 

I found fw e5810_B_latest_firmware.hex (ADVANTEST_B.01.07_REV1  02/05/16)
gunzip from offset 0x4A50 --> e5810_B_latest_firmware.bin
from e5810_B_latest_firmware.bin extracted MLO.hex (MYREKA_TORNADO_MLO_UPDATB.01.05)
from e5810_B_latest_firmware.bin extracted u-boot.hex (MYREKA_TORNADO_UB_UPDATEB.01.05)
MLO.hex -->   MLO_XMODEM.bin (dd if=MLO.hex skip=579 count=68240 bs=1 of=MLO_XMODEM.bin)
u-boot.hex --> u-boot_YMODEM.bin (dd if=u-boot.hex skip=123 count=264696 bs=1 of=u-boot_YMODEM.bin)
TeraTerm from PC sent MLO_XMODEM.bin after power up
TeraTerm from PC sent u-boot_YMODEM.bin (Myreka Tornado Init CCCC...)
E5810B is a bit functional, web access works
update firmware via ftp (FileZilla server)
E5810B is like a new one. Perhaps even better.