$ unzip -l vs4000-90A_firmware.zip 
Archive:  vs4000-90A_firmware.zip
  Length     Date   Time    Name
 --------    ----   ----    ----
    35328  12-12-01 12:22   VS4000.doc
   461097  12-12-01 12:28   cougar_v1_3.zip
 --------                   -------
   496425                   2 files

The VS4000.doc seems AbiWord compatible.  It says:

Updating Firmware by Ethernet

To update firmware across the Ethernet, the "client" system (the target system
to be updated) and the "server" system (the system that serves boot requests)
must be on the same Ethernet segment. The maintenance operation protocol (MOP)
is the transport used to copy the network image.

Enable the server system's NCP circuit.
$ MCR NCP 
NCP>SET CIRCUIT <circuit> STATE OFF 
NCP>SET CIRCUIT <circuit> SERVICE ENABLED 
NCP>SET CIRCUIT <circuit> STATE ON
<circuit> is the system Ethernet circuit. Use the SHOW
KNOWN CIRCUITS command to find the name of the circuit

Copy the file containing the updated code to the MOM$LOAD area on the server.
Use the following command: 
$ COPY <filename>.SYS MOM$LOAD:*.*
This procedure may require system privileges. <filename> is the Ethernet
bootable filename provided in the release notes

On the client system, enter the command 
BOOT/100 EZ at the console prompt (>>>). The system then prompts you for the
file name.
Note: Do not type the .SYS file extension when entering 
the Ethernet bootfile name. The MOP load protocol only supports 15-character
filenames

After the FEPROM upgrade program is loaded, press Y at the prompt to start the
FEPROM blast
CAUTION! Once you enter the bootfile name, do not interrupt the FEPROM blasting
program, as this can damage the CPU module. The program takes several minutes
to complete 
Note: On systems with a VCB02 terminal, an abbreviated form of the following
example appears

-------------------------

I don't speak that much VMS but it's clear that you just mop the file and run
it.  I slapped cougar.sys into /tftpboot/mop/COUGAR.SYS and mop'ed it and now
my box is fixed.

http://hermes.tubas.net/vs4000-90A_firmware.zip



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