How do you change the AVR trim and boost voltage levels on an APC SUA750?

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How do you change the AVR trim and boost voltage levels on an APC SUA750? This is causing major problems for me.

The trim kicks in at 126.5v at the outlet and the voltage from the UPS drops to 111.5v. This is too low for my equipment. I would rather have the AVR trim not kick in unitl 130v rather than have the trimmed voltage of 111.5

If I cannot change this I will have to return this unit.
The CDs and serial cable that came with the unit are not very understandable for me.

thanks..
DT98

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