Hi Reload,
I believe this is where you are getting stuck at:
SSG550-> save software from tftp 172.22.152.251 new/ssg500.6.3.0r17.0 to flash
Load software from TFTP 172.22.152.251 (file: new/ssg500.6.3.0r17.0).
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
(snip)
tftp received octets = 11627247
tftp success!
TFTP Succeeded
Save to flash. It may take a few minutes ...platform = 23, cpu = 11, version = 2
update new flash image (02572fd0,11627247)
platform = 23, cpu = 11, version = 2
offset = 20, address = 0, size = 11627169
date = 9422, sw_version = 808031, cksum = 954806c3
********Invalid image!!! ********Bogus image - not authenticated!!!
(snip)
If you would like to update the boot loader that is signed with the new image key on SSG Series, you must have a console connection and a TFTP server that can be reachable through the pre-assigned interface(s) in the boot loader mode (mostly ‘eth0/0’ interface) and manually interrupt the boot sequence by holding ‘Shift key’ and hit 'X' and ‘A’ sequentially when the “Hit 'X' and 'A' to upgrade bootloader” message is shown on the console.
After installing the new image key, type CLI reset command to reboot the device. Then keep the ‘Shift key’ down and hit 'X' and ‘A’ sequentially.
SSG550-> reset
System reset, are you sure? y/[n] y
In reset ...
(snip)
ScreenOS Saipanloader V1.0.7
Built Mar 19 2009/15:54:12
watchdog_probe, 1132 bus/dev/fn = 0/248 ich = 2640
boot_drive = 80
start1 = 0768, start2 = 3840
Hit 'X' and 'A' to upgrade bootloader <- Hold ‘Shift key’ and hit ‘X’ and ‘A’ in sequence
Loader File Name:new/Loadssg500v107.d <- Bootloader filename signed with the new image key
Self IP Address :172.22.152.35 <- TFTP client IP address
TFTP IP Address :172.22.152.251 <- TFTP server IP address
IP MASK :255.255.255.0
Gateway IP Address :172.22.152.1
Saipan motherboard proto 3 or later detected
Probing...[Ethernet0/0 and Ethernet0/1]
Initiating hardware and waiting for link up ...
Initiating hardware and waiting for link up ...
self_ip = 172.22.152.35, tftp_server_ip = 172.22.152.251
ip = 172.22.152.35 mask = 255.255.255.0 gw = 172.22.152.1 svr = 172.22.152.251
network_ready = 1
new/Loadssg500v107.d
121078 bytes downloaded from tftp server
old img size = 121032, new img size = 121032, load = 121078, sig = 46
S
Image authenticated! <- Bootloader is authenticated using the new image key
<snip>
write boot2's start sector back at sector 1051
write mbr back at sector 0
mounting FAT16 partition
file size = 112
size = 112, sizeof(nvram_rec) = 112
system rebooting... <- After successful bootloader installation, the device will automatically try to reboot
<snip>
The below document should help you:
https://www.juniper.net/documentation/software/screenos/screenos6.3.0/630_upgrade.pdf
Hope this helps 🙂
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Kudos are always appreciated!