How do I boot to previous firmware with Putty?

Question

Hi All, 
 
 I 'upgraded' to firmware version 17 MR2 from 17 MR1. 
 
 Since the 'upgrade' I cannot access the web UI - I get a blank page with "Internal Server Error" in the top right corner in response to login submission. 
 
 I do not have easy access to connect a terminal cable but I can get access through Putty. 
 
 Is there a way to remove the MR2 or boot to MR1 using a connection with Putty? 
 
 Thanks

ChrisKnight · Accepted Answer

When you ssh in to the firewall, go into Device Management, then Show Firmware(s). Make a note of the firmware numbers and the current firmware in use. Then go into Advanced Shell and type the following: rebootfw -f where is the firmware number not in use. That is, if Firmware 1 is the current firmware, then is 2, and vice versa.

FormerMember · Answer

Hi, 
 Navigate to the option 5 (Device Management) > Option 2 (Show Firmware (s)) 
 You will see tow firmware available as shown below. 
 Device Management 
 1. Reset to Factory Defaults 2. Show Firmware(s) 3. Advanced Shell 4. Flush Device Reports 0. Exit 
 Select Menu Number [0-4]: 2 
 Firmware 1: SFOS 17.5.7 MR-7 Firmware 2: SFOS 17.5.8 MR-8 Current Firmware: Firmware 2 In my case I had current firmware 17.5.8 MR8 so I had to run : rebootfw -f 1 and firewall rebooted with the firmware version 17.5.7 MR-7. 
 SFVUNL_VM01_SFOS 17.5.8 MR-8# rebootfw -f 1 
 Firewall rebooted with 17.5.7 MR-7 
 Firmware 1: SFOS 17.5.7 MR-7 Firmware 2: SFOS 17.5.8 MR-8 Current Firmware: Firmware 1 
 Thanks,

KamalPatel · Answer

Hi, 
 
 see the below link for boot old Firmware. 
 i am also received the same issue after upgrading. 
 community.sophos.com/.../125209