How to boot Extreme x670-48x into backup BootRom?

Question

Iron

Hello, I have an Extreme x670-48x switch that refuses to boot.
Outputs to the console:

Extreme Networks


Alternate BootStrap Image
Starting CRC of Default image


************************************************
* WARNING: Default BootLoader image is corrupt *
* Default BootLoader needs to be reinstalled   *
************************************************


 Processor ID = 000c8801
Set up DRAM
Aabcdefghijklmnopq1rEv
Memsize = 40000000
DRAM Post
Testing Dram

Running DRAM mats
DRAM mats Passed
SDRAM Memory setup complete.
Copy BootROM to execute location...
start = 9fc00000
copytoram = 9fc0c620
s0 = 1fbf0000
Copy BootROM to execute location done.
MSIZ
CPUF
RELS
RELC
DBGI

Does not respond to key presses.
In the BlackDiamond line on the MSM, there is a microswitch, holding which the switch boots from the backup BootROM. I did not find anything like that on the same switch (I took it apart).
Although studying the flash memory dump (made earlier in the linux shell using dd), it is clearly visible that two copies of BootROM are written to it.
Is it possible with a key/jumper combination on the board to force the switch to boot into a backup BootROM?

Answer 1

if you have access to the console
You can view the software on the switch by issuing the show switch command. To select a boot partition
(for example, to download new software to the secondary partition
), you need to run the command: use image secondary ways if there are questions about extreme sports, then my skype is johnsn123

Answer 2

I know how to update software from BootROM, the problem is that it is broken and there is no access to the console. The same Concepts Guide describes how to load a BD from a backup BootROM, but for younger models this is not possible, although, as I already wrote, in the flash dump, which I made earlier from debug-mode, there are two copies of BootROM. I just hoped that there might be some kind of jumper to load a backup boot.
Z.Y. no one knows where to get the description of the processor? It is defined like this:

/exos/bin # cat /proc/cpuinfo
system type             : RMI XLS Unknown A1
processor               : 0
cpu model               : RMI Phoenix V0.1
BogoMIPS                : 658.63
wait instruction        : no
microsecond timers      : yes
tlb_entries             : 64
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 1, address/irw mask: [0x0fff]
ASEs implemented        :
shadow register sets    : 1
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

processor               : 1
cpu model               : RMI Phoenix V0.1
BogoMIPS                : 658.63
wait instruction        : no
microsecond timers      : yes
tlb_entries             : 64
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 1, address/irw mask: [0x0fff]
ASEs implemented        :
shadow register sets    : 1
core                    : 1
VCED exceptions         : not available
VCEI exceptions         : not available

There are thoughts to try to dig deeper through JTAG.