SNMP Timeout for MFC-420CN

[skatermem]

I tried to get the firmware for my MFC-420CN that has firmware version A (the latest C or G) but I get SNMP timeouts with the script I assume because the printer supports SNMP v1 only. So I constructed a manual XML request based on version 1 format, but Brother's update server always returns a response code of 2.

I've experimented with different SPECs and VERSIONs, but no success so far.

<?xml version="1.0" encoding="UTF-8"?>
<REQUESTINFO>
    <FIRMUPDATETOOLINFO>
        <FIRMCATEGORY>MAIN</FIRMCATEGORY>
        <OS>MAC_10.10</OS>
        <OSVERSION>10.16</OSVERSION>
        <INSPECTMODE>null</INSPECTMODE>
    </FIRMUPDATETOOLINFO>
    <FIRMUPDATEINFO>
        <MODELINFO>
            <SELIALNO>U61084J5F158338</SELIALNO>
            <NAME>MFC-420CN</NAME>
            <SPEC></SPEC>
            <DRIVER>MFC-420CN</DRIVER>
            <FIRMINFO>
                <FIRM>
                    <ID>MAIN</ID>
                    <VERSION>2A506022159:2895</VERSION>
                </FIRM>
            </FIRMINFO>
        </MODELINFO>
        <DRIVERCNT>1</DRIVERCNT>
        <LOGNO>2</LOGNO>
        <ERRBIT/>
        <NEEDRESPONSE>1</NEEDRESPONSE>
    </FIRMUPDATEINFO>
</REQUESTINFO>

I posted it with this:

curl -X POST -d @request.xml https://firmverup.brother.co.jp/kne_bh7_update_nt_ssl/ifax2.asmx/fileUpdate -H "Content-Type:text/xml"

I always get this response:

<?xml version="1.0" encoding="UTF-8" ?>
<RESPONSEINFO>
    <FIRMUPDATEINFO>
        <VERSIONCHECK>2</VERSIONCHECK>
    </FIRMUPDATEINFO>
</RESPONSEINFO>

Has anyone had any luck with these old printers?