Upgraded to latest firmware by uploading aos325.bin and sumx326.bin via FTP.
ftp://ftp.apc.com/apc/public/hardware/webcard/firmware/sumx/v326/
I used the following patch to fix apcupsd:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=655741
===== --- a/src/drivers/snmplite/apc-mib.cpp +++ b/src/drivers/snmplite/apc-mib.cpp @@ -307,6 +307,8 @@ break; case CI_Overload: + if (data.str.len() < 9) + break; Dmsg1(80, "Got CI_Overload: %c\n", data.str[8]); if (data.str[8] == '1') ups->set_overload(); =====