ELTEX ESR Series - 6.2 Updating firmware via bootloader

ESR-Series. User manual
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esr# copy sftp://<server>:/<file_name> system:boot-2
6.2 Updating firmware via bootloader
Router firmware may be updated via the bootloader as follows:
When U-Boot finishes the router initialization, break the device startup with the <Esc> key.
Configuring PoE...
distribution 1 dest_threshold 0xa drop_timer 0x0
Configuring POE in bypass mode
NAE configuration done!
initializing port 0, type 2.
initializing port 1, type 2.
SMC Endian Test:b81fb81f
nae-0, nae-1
=======Skip: Load SYS UCORE for old 8xxB1/3xxB0 revision on default.
Hit any key to stop autoboot: 2
Specify TFTP server address:
BRCM.XLP316Lite Rev B0.u-boot# serverip 10.100.100.1
For version 1.5 and newer:
BRCM.XLP316Lite Rev B0.u-boot# serverip 10.100.100.1
Specify router IP address:
BRCM.XLP316Lite Rev B0.u-boot# ipaddr 10.100.100.2
For version 1.5 and newer:
BRCM.XLP316Lite Rev B0.u-boot# ipaddr 10.100.100.2
Specify the name of the frimware file on the TFTP server:
BRCM.XLP316Lite Rev B0.u-boot# firmware_file firmware
For version 1.5 and newer:
BRCM.XLP316Lite Rev B0.u-boot# firmware_file firmware
You may save the environment using 'saveenv' command for future updates.