How to downgrade the JunOS ver 13.3R4.6 to 8.3R4.3 on M10i or M7i router

How to downgrade the JunOS ver 13.3R4.6 to 8.3R4.3 on M10i or M7i router

The following procedure will show you how to downgrade the JunOS ver 13.3R4.6 to 8.3R4.3

Files required:jinstall-8.3R4.3-domestic-signed.tgz

tools: TFTP server

root# run show version
Model: m10i
Junos: 13.3R4.6
JUNOS Base OS boot [13.3R4.6]
JUNOS Base OS Software Suite [13.3R4.6]
JUNOS Kernel Software Suite [13.3R4.6]
JUNOS Crypto Software Suite [13.3R4.6]
JUNOS Packet Forwarding Engine Support (M/T/EX Common) [13.3R4.6]
JUNOS Packet Forwarding Engine Support (M7i/M10i) [13.3R4.6]
JUNOS Online Documentation [13.3R4.6]
JUNOS Services AACL Container package [13.3R4.6]
JUNOS Services Application Level Gateways [13.3R4.6]
JUNOS AppId Services [13.3R4.6]
JUNOS Border Gateway Function package [13.3R4.6]
JUNOS Services Captive Portal and Content Delivery Container package [13.3R4.6]
JUNOS Services HTTP Content Management package [13.3R4.6]
JUNOS IDP Services [13.3R4.6]
JUNOS Services Jflow Container package [13.3R4.6]
JUNOS Services LL-PDF Container package [13.3R4.6]
JUNOS Services MobileNext Software package [13.3R4.6]
JUNOS Services Mobile Subscriber Service Container package [13.3R4.6]
JUNOS Services NAT [13.3R4.6]
JUNOS Services PTSP Container package [13.3R4.6]
JUNOS Services RPM [13.3R4.6]
JUNOS Services Stateful Firewall [13.3R4.6]
JUNOS Voice Services Container package [13.3R4.6]
JUNOS Services Crypto [13.3R4.6]
JUNOS Services SSL [13.3R4.6]
JUNOS Services IPSec [13.3R4.6]
JUNOS platform Software Suite [13.3R4.6]
JUNOS Routing Software Suite [13.3R4.6]
JUNOS Runtime Software Suite [13.3R4.6]
JUNOS py-base-i386 [13.3R4.6]

[edit]
root#

root# run show configuration
## Last commit: 2019-01-04 20:18:05 UTC by root
version 13.3R4.6;
system {
root-authentication {
encrypted-password "$1$oe.V90u/$eWRtGtuawy4HHs08i7okT0"; ## SECRET-DATA
}
login {
user carlos {
uid 2004;
class super-user;
authentication {
encrypted-password "$1$faORvlzM$hgl9JcCobMOkhM4hcxNTL0"; ## SECRET-DATA
}
}
}
services {
ftp;
}
syslog {
user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
}
}
interfaces {
fxp0 {
unit 0 {
family inet {
address 192.168.0.205/24;
}
}
}
}

[edit]
root#

root# exit
Exiting configuration mode

router has a 2 RE-850 (Routing Engine) RE0 and RE 1 both RE need to be downgrade.

root>request system software add /var/tmp/jinstall-8.3R4.3-domestic-signed.tgz re0

Saving the config files ...
NOTICE: uncommitted changes have been saved in /var/db/config/juniper.conf.pre-install
Installing the bootstrap installer ...

WARNING: A REBOOT IS REQUIRED TO LOAD THIS SOFTWARE CORRECTLY. Use the
WARNING: 'request system reboot' command when software installation is
WARNING: complete. To abort the installation, do not reboot your system,
WARNING: instead use the 'request system software delete jinstall'
WARNING: command as soon as this operation completes.

Saving state for rollback ...

root>

root>request system software add /var/tmp/jinstall-8.3R4.3-domestic-signed.tgz re1

root> request system reboot
Reboot the system ? [yes,no] (no) yes

*** FINAL System shutdown message from root@ ***

System going down IMMEDIATELY

Shutdown NOW!
[pid 6674]

root>

root> show version
Model: m7i
JUNOS Base OS boot [8.3R4.3]
JUNOS Base OS Software Suite [8.3R4.3]
JUNOS Kernel Software Suite [8.3R4.3]
JUNOS Crypto Software Suite [8.3R4.3]
JUNOS Packet Forwarding Engine Support (M/T Common) [8.3R4.3]
JUNOS Packet Forwarding Engine Support (M7i/M10i) [8.3R4.3]
JUNOS Online Documentation [8.3R4.3]
JUNOS Routing Software Suite [8.3R4.3]

root> show chassis hardware detail
Hardware inventory:
Item Version Part number Serial number Description
Chassis K2631 M7i
Midplane REV 07 710-008761 AAFV1224 M7i Midplane
Power Supply 0 Rev 08 740-008537 YM61335 AC Power Supply
Power Supply 1 Rev 08 740-008537 YM60965 AC Power Supply
Routing Engine REV 08 740-011202 9009028428 RE-850
ad0 999 MB SILICONSYSTEMS INC 1GB B91031C88RRW09096H07 Compact Flash
ad1 38154 MB FUJITSU MHV2040AS NT14T842D25J Hard Disk
CFEB REV 07 750-010464 CM8004 Internet Processor II
FPC 0 E-FPC
PIC 1 REV 08 750-010238 RL3346 1x G/E SFP, 1000 BASE
PIC 3 REV 10 750-010238 AAAT5046 1x G/E SFP, 1000 BASE
FPC 1 E-FPC
PIC 2 REV 07 750-009487 CL5677 ASP - Integrated (Layer-2-3)
PIC 3 REV 11 750-009099 AAFX4954 1x G/E, 1000 BASE
Fan Tray Rear Fan Tray

root> show chassis routing-engine
Routing Engine status:
Temperature 22 degrees C / 71 degrees F
CPU temperature 24 degrees C / 75 degrees F
DRAM 1536 MB
Memory utilization 14 percent
CPU utilization:
User 0 percent
Background 0 percent
Kernel 2 percent
Interrupt 0 percent
Idle 98 percent
Model RE-850
Serial ID 9009028428
Start time 2019-01-04 21:02:27 UTC
Uptime 5 minutes, 7 seconds
Load averages: 1 minute 5 minute 15 minute
0.11 0.30 0.18

root> show chassis environment
Class Item Status Measurement
Power Power Supply 0 OK
Power Supply 1 OK
Temp Intake OK 20 degrees C / 68 degrees F
FPC 0 OK 20 degrees C / 68 degrees F
Power Supplies OK 20 degrees C / 68 degrees F
CFEB Intake OK 21 degrees C / 69 degrees F
CFEB Exhaust OK 25 degrees C / 77 degrees F
Routing Engine OK 22 degrees C / 71 degrees F
Fans Fan 1 OK Spinning at normal speed
Fan 2 OK Spinning at normal speed
Fan 3 OK Spinning at normal speed
Fan 4 OK Spinning at normal speed

root> show chassis alarms
1 alarms currently active
Alarm time Class Description
2019-01-04 21:03:54 UTC Major Host 0 fxp0: Ethernet Link Down

root> show system alarms
1 alarms currently active
Alarm time Class Description
2019-01-04 21:03:54 UTC Major Host 0 fxp0: Ethernet Link Down

root>