So, I am now the proud owner of a Brocade TX24. Or at least, that what the system tells me 
@fohdeesha talked me through the process, but it was actually pretty easy, once I got it going.
Before we could get started, I had to solve some other problems: I was using a usb-serial adapter on my macbook which gave garbled output. Switching to an old Xubuntu laptop using screen helped.
As @fohdeesha stated above, the actual flashing is only two commands. You copy two files to a TFTP server (I used my Synology) and the LB6M boots from there. Then you copy the running Brocade bootloader over the Fasthpath boot loader. Finally, you start the actual Brocade TX24 OS and write that to flash.
After flashing successfully, we shortly tried a few different settings such as inter-vlan routing (which is now pretty easy to do!) and setting vlan ports. I have not stress-tested the switch yet, but this will now become my new core switch, now that inter-vlan routing works, so that stress testing will follow in a not-too-distant future.
Lots of thanks to @fohdeesha and crew for figuring this out!
Following some output from the 'new' switch:
telnet@TX24 Router#show version
SW: Version 08.0.01eT203 Copyright (c) 1996-2013 Brocade Communications Systems, Inc. All rights reserved.
Compiled on Jul 15 2015 at 07:12:50 labeled as TIR08001e
(6845067 bytes) from Primary brocadeimage.bin
Compressed Boot-Monitor Image size = 369366, Version:07.3.00T205 (trz07300)
HW: Stackable TurboIron-X24
==========================================================================
Serial #: ??LB6M
P-ASIC 0: type B820, rev 11 subrev 00
==========================================================================
825 MHz Power PC processor MPC8541E (version 8020/0020) 330 MHz bus
512 KB boot flash memory
31744 KB code flash memory
512 MB DRAM
The system uptime is 6 minutes 31 seconds
The system : started=cold start
telnet@TX24 Router>show chassis
Power supply 1 (NA - NA - Regular) present, status ok
Power supply 2 (NA - NA - Regular) present, status ok
Fan 1 ok, speed (auto): [[1]]<->2<->3
Fan 2 ok, speed (auto): [[1]]<->2<->3
Fan 3 ok, speed (auto): [[1]]<->2<->3
Fan controlled temperature: 24.0 deg-C
Fan speed switching temperature thresholds:
Speed 1: NM<----->30 deg-C
Speed 2: 25<----->65 deg-C
Speed 3: 60<----->90 deg-C (shutdown)
Exhaust Side Temperature Readings:
Current temperature : 24.0 deg-C
Warning level.......: 80.0 deg-C
Shutdown level......: 90.0 deg-C
Intake Side Temperature Readings:
Current temperature : 21.0 deg-C
Boot Prom MAC: 00e0.5200.0100
@fohdeesha talked me through the process, but it was actually pretty easy, once I got it going.
Before we could get started, I had to solve some other problems: I was using a usb-serial adapter on my macbook which gave garbled output. Switching to an old Xubuntu laptop using screen helped.
As @fohdeesha stated above, the actual flashing is only two commands. You copy two files to a TFTP server (I used my Synology) and the LB6M boots from there. Then you copy the running Brocade bootloader over the Fasthpath boot loader. Finally, you start the actual Brocade TX24 OS and write that to flash.
After flashing successfully, we shortly tried a few different settings such as inter-vlan routing (which is now pretty easy to do!) and setting vlan ports. I have not stress-tested the switch yet, but this will now become my new core switch, now that inter-vlan routing works, so that stress testing will follow in a not-too-distant future.
Lots of thanks to @fohdeesha and crew for figuring this out!
Following some output from the 'new' switch:
telnet@TX24 Router#show version
SW: Version 08.0.01eT203 Copyright (c) 1996-2013 Brocade Communications Systems, Inc. All rights reserved.
Compiled on Jul 15 2015 at 07:12:50 labeled as TIR08001e
(6845067 bytes) from Primary brocadeimage.bin
Compressed Boot-Monitor Image size = 369366, Version:07.3.00T205 (trz07300)
HW: Stackable TurboIron-X24
==========================================================================
Serial #: ??LB6M
P-ASIC 0: type B820, rev 11 subrev 00
==========================================================================
825 MHz Power PC processor MPC8541E (version 8020/0020) 330 MHz bus
512 KB boot flash memory
31744 KB code flash memory
512 MB DRAM
The system uptime is 6 minutes 31 seconds
The system : started=cold start
telnet@TX24 Router>show chassis
Power supply 1 (NA - NA - Regular) present, status ok
Power supply 2 (NA - NA - Regular) present, status ok
Fan 1 ok, speed (auto): [[1]]<->2<->3
Fan 2 ok, speed (auto): [[1]]<->2<->3
Fan 3 ok, speed (auto): [[1]]<->2<->3
Fan controlled temperature: 24.0 deg-C
Fan speed switching temperature thresholds:
Speed 1: NM<----->30 deg-C
Speed 2: 25<----->65 deg-C
Speed 3: 60<----->90 deg-C (shutdown)
Exhaust Side Temperature Readings:
Current temperature : 24.0 deg-C
Warning level.......: 80.0 deg-C
Shutdown level......: 90.0 deg-C
Intake Side Temperature Readings:
Current temperature : 21.0 deg-C
Boot Prom MAC: 00e0.5200.0100
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