Hi After upgrading to Junos 21.4R3-S4.9 I've noted a warning message about incompatible boot loader during boot. -----

Hit [Enter] to boot immediately, or any other key for command prompt.

Booting [/kernel]...

Kernel entry at 0x801000c0...

Kernel args: (null)

WARNING: Incompatible loader version1.2 You need to upgrade to 1.5 or above

init regular console

Primary ICache: Sets 16 Size 128 Asso 39

Primary DCache: Sets 8 Size 128 Asso 32

Secondary DCache: Sets 1024 Size 128 Asso 4

• Incompatible loader version1.2 You need to upgrade to 1.5 or above.

In order to check the current boot loader version, please start shell mode to run the command kenv:

>start shell

% kenv

LINES="24"

    boot.ver="3.5"    

    loader.name="FreeBSD/MIPS U-Boot bootstrap loader"

    loader.version="2.9"   

    root@% 

To proceed with the upgrade for the bootloader, proceed as follow:

>start shell

>bootupgrade –u /boot/uboot –l /boot/loader

>bootupgrade -s -u– (this to upgrade the backup loader)

Updating BIOS and firmware (SRX only)

[SRX] Where to find u-boot and loader files for SRX Branch devices