ALOM upgrade problem

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In our environment, we were upgrading a Sun Fire V240 system's ALOM to >= 1.6 to enable network management via ssh. However, we could not install the latest version of ALOM--v1.6.6 as of this writing--as the system's OBP is too old.

ALOM v1.6.6 requires a minimum OBP of 4.11.4. However, we couldn't upgrade OBP as OBP 4.11.4 or later requires ALOM v1.2. 

# /usr/platform/`uname -i`/sbin/scadm version

SC Version v1.0
SC Bootmon Version:  v1.0.0
SC Firmware Version:  v1.0.0

# /usr/platform/`uname -i`/sbin/prtdiag -v | tail -4
System PROM revisions:
----------------------
OBP 4.8.2 2003/03/27 13:22 Sun Fire V210/V240
OBDIAG 4.8.2 2003/03/27 13:23

Fortunately, we located ALOM v1.3 on one of our network volumes; Sun does not allow downloading previous versions of ALOM[1]. We were able to upgrade ALOM v1.0.0 ALOM v1.3.0. We can now upgrade OBP, and then upgrade to the latest ALOM.

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