Есть два каталиста 3750 в стеке (соединены шлейфом наподобии сказевого).
Все как бы путем:
#sh ver
Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(25)SEB1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Fri 29-Apr-05 23:58 by yenanh

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEB1, RELEASE SOFTWARE (fc)

C3750G01 uptime is 2 minutes
System returned to ROM by power-on
System image file is "flash:/c3750-ipbase-mz.122-25.SEB1/c3750-ipbase-mz.122-25.SEB1.bin"

.....
.....
.....

cisco WS-C3750G-12S (PowerPC405) processor (revision M0) with 118784K/12280K bytes of memory.

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
     1   24     WS-C3750G-24T      12.2(25)SEB2            C3750-IPBASE-M
*    2   12     WS-C3750G-12S      12.2(25)SEB1            C3750-IPBASE-M

Захотелось мне от этой циски полисей. Обзавелся подходящим иосом (c3750-advipservicesk9-mz.122-25.SED1.bin), залил его через tftp.
На циске обнаружилось две флешки с тремя названиями - flash (flash и flash2) и flash1.
Скопировал на обе. Получилось:
C3750#dir flash:
Directory of flash:/

    2  -rwx        7876   Mar 1 1993 06:01:01 +06:00  vlan.dat
    3  -rwx     7824180   Apr 9 2009 19:18:03 +06:00  c3750-advipservicesk9-mz.122-25.SED1.bin
    4  -rwx       21631   Mar 1 1993 06:03:11 +06:00  config.text
    5  drwx         192   Mar 1 1993 06:05:26 +06:00  c3750-ipbase-mz.122-25.SEB1
  364  -rwx          46   Mar 1 1993 06:03:11 +06:00  private-config.text

15998976 bytes total (1037312 bytes free)
C3750#dir flash1:
Directory of flash1:/

    2  -rwx        7876   Apr 9 2009 16:21:24 +06:00  vlan.dat
    3  -rwx     7824180   Apr 9 2009 19:25:22 +06:00  c3750-advipservicesk9-mz.122-25.SED1.bin
    4  -rwx       21554   Apr 9 2009 19:30:31 +06:00  config.text
    5  drwx         192   Mar 1 1993 06:05:59 +06:00  c3750-ipbase-mz.122-25.SEB2
  363  -rwx          27   Apr 9 2009 19:30:31 +06:00  private-config.text

15998976 bytes total (1036288 bytes free)

Далее прописал:
C3750G01(config)#boot system flash:c3750-advipservicesk9-mz.122-25.SED1.bin

И с этого момента начались чудеса. Одна из цисок грузилась со старым иосом, другая с новым.

C3750G01#sh ver
Cisco IOS Software, C3750 Software (C3750-ADVIPSERVICESK9-M), Version 12.2(25)SED1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Tue 22-Nov-05 23:37 by yenanh
Image text-base: 0x00003000, data-base: 0x0119A6B0

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEB1, RELEASE SOFTWARE (fc)

C3750G01 uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:/c3750-advipservicesk9-mz.122-25.SED1.binn"

.....
.....
.....

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
     1   0      WS-C3750G-24T      12.2(25)SEB2            C3750-IPBASE-M
*    2   12     WS-C3750G-12S      12.2(25)SED1            C3750-ADVIPSERVICESK

Как видно, первая циска загружается, но порты у нее все отключены. В логе написано:
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_COPY_SW_INITIATED: Auto-copy-software process initiated for switch number(s) 1
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_COPY_SW:
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_COPY_SW: Searching for stack member to act
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_COPY_SW: as software donor...
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_COPY_SW: Software was not copied
*Mar  1 06:03:09.029: %IMAGEMGR-6-AUTO_ADVISE_SW_INITIATED: Auto-advise-software process initiated for switch number(s) 1
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW:
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW:
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: Systems with incompatible software have
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: been added to the stack.  The storage
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: devices on all of the stack members have
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: been scanned, and the software required
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: to make all stack members compatible with
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: each other was not found. The "archive
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: download-sw" command can be used to
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: install software off of the network from
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW: a tar file.
*Mar  1 06:03:09.130: %IMAGEMGR-6-AUTO_ADVISE_SW:
Apr  9 19:38:13.932: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Apr  9 19:38:14.033: %STACKMGR-6-SWITCH_REMOVED: Switch 1 has been REMOVED from the stack
Apr  9 19:39:15.337: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Apr  9 19:39:20.287: %STACKMGR-6-SWITCH_ADDED_VM: Switch 1 has been ADDED to the stack (VERSION_MISMATCH)
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_COPY_SW_INITIATED: Auto-copy-software process initiated for switch number(s) 1
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_COPY_SW:
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_COPY_SW: Searching for stack member to act
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_COPY_SW: as software donor...
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_COPY_SW: Software was not copied
Apr  9 19:41:20.295: %IMAGEMGR-6-AUTO_ADVISE_SW_INITIATED: Auto-advise-software process initiated for switch number(s) 1
Apr  9 19:41:20.396: %IMAGEMGR-6-AUTO_ADVISE_SW:
Apr  9 19:41:20.396: %IMAGEMGR-6-AUTO_ADVISE_SW:
Apr  9 19:41:20.396: %IMAGEMGR-6-AUTO_ADVISE_SW: Systems with incompatible software have
Apr  9 19:41:20.396: %IMAGEMGR-6-AUTO_ADVISE_SW: been added to the stack.  The storage

В итоге кое-как удалось вернуть их к прежнему иосу - удалив новый иос с обоих флешек.  Т.е. у меня опять одновременно работают две циски со старым иосом.

В итоге вопрос к грамотным цискарям - как мне проапргейдить иос на этом стеке?
Или я делал что-то неправильно?