Can the Digifant system be reset for high altitude operations?

 I thought there was supposed to be altitude correction, but on my recent
vacation in my '90 Syncro Westie, above 12,000 feet I had consistent
stalling at idle and a very significant loss of power. Engine freshly tuned,
off course.

Any ideas?

Thanks

Tom F.
90 Syncro Westie
83.5 9 Pax S/R GL

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